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

use crate::key;
#[cfg(feature = "logging")]
use crate::log::{debug, trace};
use crate::msgs::handshake::{DistinguishedName, DistinguishedNames};
use crate::x509;

/// A trust anchor, commonly known as a "Root Certificate."
#[derive(Debug, Clone)]
pub struct OwnedTrustAnchor {
    subject: Vec<u8>,
    spki: Vec<u8>,
    name_constraints: Option<Vec<u8>>,
}

impl OwnedTrustAnchor {
    /// Get a `webpki::TrustAnchor` by borrowing the owned elements.
    pub(crate) fn to_trust_anchor(&self) -> webpki::TrustAnchor {
        webpki::TrustAnchor {
            subject: &self.subject,
            spki: &self.spki,
            name_constraints: self.name_constraints.as_deref(),
        }
    }

    /// Constructs an `OwnedTrustAnchor` from its components.
    ///
    /// `subject` is the subject field of the trust anchor.
    ///
    /// `spki` is the `subjectPublicKeyInfo` field of the trust anchor.
    ///
    /// `name_constraints` is the value of a DER-encoded name constraints to
    /// apply for this trust anchor, if any.
    pub fn from_subject_spki_name_constraints(
        subject: impl Into<Vec<u8>>,
        spki: impl Into<Vec<u8>>,
        name_constraints: Option<impl Into<Vec<u8>>>,
    ) -> Self {
        Self {
            subject: subject.into(),
            spki: spki.into(),
            name_constraints: name_constraints.map(|x| x.into()),
        }
    }
}

/// A container for root certificates able to provide a root-of-trust
/// for connection authentication.
#[derive(Debug, Clone)]
pub struct RootCertStore {
    /// The list of roots.
    pub roots: Vec<OwnedTrustAnchor>,
}

impl RootCertStore {
    /// Make a new, empty `RootCertStore`.
    pub fn empty() -> Self {
        Self { roots: Vec::new() }
    }

    /// Return true if there are no certificates.
    pub fn is_empty(&self) -> bool {
        self.len() == 0
    }

    /// Say how many certificates are in the container.
    pub fn len(&self) -> usize {
        self.roots.len()
    }

    /// Return the Subject Names for certificates in the container.
    pub fn subjects(&self) -> DistinguishedNames {
        let mut r = DistinguishedNames::new();

        for ota in &self.roots {
            let mut name = Vec::new();
            name.extend_from_slice(&ota.subject);
            x509::wrap_in_sequence(&mut name);
            r.push(DistinguishedName::new(name));
        }

        r
    }

    /// Add a single DER-encoded certificate to the store.
    pub fn add(&mut self, der: &key::Certificate) -> Result<(), webpki::Error> {
        let ta = webpki::TrustAnchor::try_from_cert_der(&der.0)?;
        let ota = OwnedTrustAnchor::from_subject_spki_name_constraints(
            ta.subject,
            ta.spki,
            ta.name_constraints,
        );
        self.roots.push(ota);
        Ok(())
    }

    /// Adds all the given TrustAnchors `anchors`.  This does not
    /// fail.
    pub fn add_server_trust_anchors(
        &mut self,
        trust_anchors: impl Iterator<Item = OwnedTrustAnchor>,
    ) {
        self.roots.extend(trust_anchors)
    }

    /// Parse the given DER-encoded certificates and add all that can be parsed
    /// in a best-effort fashion.
    ///
    /// This is because large collections of root certificates often
    /// include ancient or syntactically invalid certificates.
    ///
    /// Returns the number of certificates added, and the number that were ignored.
    pub fn add_parsable_certificates(&mut self, der_certs: &[Vec<u8>]) -> (usize, usize) {
        let mut valid_count = 0;
        let mut invalid_count = 0;

        for der_cert in der_certs {
            #[cfg_attr(not(feature = "logging"), allow(unused_variables))]
            match self.add(&key::Certificate(der_cert.clone())) {
                Ok(_) => valid_count += 1,
                Err(err) => {
                    trace!("invalid cert der {:?}", der_cert);
                    debug!("certificate parsing failed: {:?}", err);
                    invalid_count += 1
                }
            }
        }

        debug!(
            "add_parsable_certificates processed {} valid and {} invalid certs",
            valid_count, invalid_count
        );

        (valid_count, invalid_count)
    }
}