alibi-plugins 0.10.0

Built-in authentication plugins and API metadata for Alibi
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

//! Application policies for configured SAML signing and digest algorithms.
#[derive(Clone, Copy, Debug, Default, PartialEq, Eq)]
pub enum SsoDeprecatedAlgorithmBehavior {
    Reject,
    #[default]
    Warn,
    Allow,
}
/// Admission policy for configured algorithms at provider registration and update.
#[derive(Clone, Debug, Default)]
pub struct SsoSamlSigningPolicy {
    pub on_deprecated: SsoDeprecatedAlgorithmBehavior,
    pub allowed_signature_algorithms: Option<Vec<String>>,
    pub allowed_digest_algorithms: Option<Vec<String>>,
}

use super::{AuthError, AuthResult, Value};
const SIGNATURES: &[(&str, &str)] = &[
    ("sha1", "http://www.w3.org/2000/09/xmldsig#rsa-sha1"),
    (
        "sha256",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256",
    ),
    (
        "sha384",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha384",
    ),
    (
        "sha512",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha512",
    ),
    ("rsa-sha1", "http://www.w3.org/2000/09/xmldsig#rsa-sha1"),
    (
        "rsa-sha256",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha256",
    ),
    (
        "rsa-sha384",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha384",
    ),
    (
        "rsa-sha512",
        "http://www.w3.org/2001/04/xmldsig-more#rsa-sha512",
    ),
    (
        "ecdsa-sha256",
        "http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha256",
    ),
    (
        "ecdsa-sha384",
        "http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha384",
    ),
    (
        "ecdsa-sha512",
        "http://www.w3.org/2001/04/xmldsig-more#ecdsa-sha512",
    ),
];
const DIGESTS: &[(&str, &str)] = &[
    ("sha1", "http://www.w3.org/2000/09/xmldsig#sha1"),
    ("sha256", "http://www.w3.org/2001/04/xmlenc#sha256"),
    ("sha384", "http://www.w3.org/2001/04/xmldsig-more#sha384"),
    ("sha512", "http://www.w3.org/2001/04/xmlenc#sha512"),
];
fn normalize<'a>(algorithm: &'a str, names: &[(&str, &'static str)]) -> &'a str {
    names
        .iter()
        .find(|(name, _)| name.eq_ignore_ascii_case(algorithm))
        .map_or(algorithm, |(_, uri)| *uri)
}
fn failure(code: &str, message: String) -> AuthError {
    AuthError::Api {
        status: 400,
        code: Some(code.into()),
        message,
    }
}
pub(super) fn validate(config: &Value, policy: &SsoSamlSigningPolicy) -> AuthResult<()> {
    for (field, label, names, allowed) in [
        (
            "signatureAlgorithm",
            "signature",
            SIGNATURES,
            &policy.allowed_signature_algorithms,
        ),
        (
            "digestAlgorithm",
            "digest",
            DIGESTS,
            &policy.allowed_digest_algorithms,
        ),
    ] {
        let Some(algorithm) = config
            .get(field)
            .and_then(Value::as_str)
            .filter(|value| !value.is_empty())
        else {
            continue;
        };
        let normalized = normalize(algorithm, names);
        if let Some(allowed) = allowed {
            if !allowed
                .iter()
                .any(|value| normalize(value, names) == normalized)
            {
                return Err(failure(
                    "SAML_ALGORITHM_NOT_ALLOWED",
                    format!("SAML {label} algorithm not in allow-list: {algorithm}"),
                ));
            }
            continue;
        }
        if names.first().is_some_and(|(_, uri)| normalized == *uri) {
            let message = format!(
                "SAML config uses deprecated {label} algorithm: {algorithm}. Consider using SHA-256 or stronger."
            );
            match policy.on_deprecated {
                SsoDeprecatedAlgorithmBehavior::Reject => {
                    return Err(failure("SAML_DEPRECATED_CONFIG_ALGORITHM", message));
                }
                SsoDeprecatedAlgorithmBehavior::Warn => tracing::warn!("{message}"),
                SsoDeprecatedAlgorithmBehavior::Allow => {}
            }
        } else if !names.iter().any(|(_, uri)| *uri == normalized) {
            return Err(failure(
                "SAML_UNKNOWN_ALGORITHM",
                format!("SAML {label} algorithm not recognized: {algorithm}"),
            ));
        }
    }
    Ok(())
}