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

use super::UnparsedObject;
use crate::error::X509Result;
use crate::prelude::format_serial;
use crate::traits::FromDer;
use crate::x509::X509Name;
use der_parser::der::*;
use der_parser::error::BerError;
use der_parser::oid::Oid;
use nom::bytes::streaming::take;
use nom::combinator::{all_consuming, verify};
use nom::{Err, IResult, Needed};
use std::fmt;

#[derive(Clone, Debug, PartialEq)]
/// Represents a GeneralName as defined in RFC5280. There
/// is no support X.400 addresses and EDIPartyName.
///
/// String formats are not validated.
pub enum GeneralName<'a> {
    OtherName(Oid<'a>, &'a [u8]),
    /// More or less an e-mail, the format is not checked.
    RFC822Name(&'a str),
    /// A hostname, format is not checked.
    DNSName(&'a str),
    /// X400Address,
    X400Address(UnparsedObject<'a>),
    /// RFC5280 defines several string types, we always try to parse as utf-8
    /// which is more or less a superset of the string types.
    DirectoryName(X509Name<'a>),
    /// EDIPartyName
    EDIPartyName(UnparsedObject<'a>),
    /// An uniform resource identifier. The format is not checked.
    URI(&'a str),
    /// An ip address, provided as encoded.
    IPAddress(&'a [u8]),
    RegisteredID(Oid<'a>),
}

impl<'a> FromDer<'a> for GeneralName<'a> {
    fn from_der(i: &'a [u8]) -> X509Result<'a, Self> {
        parse_generalname(i).map_err(Err::convert)
    }
}

impl<'a> fmt::Display for GeneralName<'a> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            GeneralName::OtherName(oid, _) => write!(f, "OtherName({}, [...])", oid),
            GeneralName::RFC822Name(s) => write!(f, "RFC822Name({})", s),
            GeneralName::DNSName(s) => write!(f, "DNSName({})", s),
            GeneralName::X400Address(_) => write!(f, "X400Address(<unparsed>)"),
            GeneralName::DirectoryName(dn) => write!(f, "DirectoryName({})", dn),
            GeneralName::EDIPartyName(_) => write!(f, "EDIPartyName(<unparsed>)"),
            GeneralName::URI(s) => write!(f, "URI({})", s),
            GeneralName::IPAddress(b) => write!(f, "IPAddress({})", format_serial(b)),
            GeneralName::RegisteredID(oid) => write!(f, "RegisteredID({})", oid),
        }
    }
}

pub(crate) fn parse_generalname<'a>(i: &'a [u8]) -> IResult<&'a [u8], GeneralName, BerError> {
    let (rest, hdr) = verify(der_read_element_header, |hdr| hdr.is_contextspecific())(i)?;
    let len = hdr.length().definite()?;
    if len > rest.len() {
        let needed = Needed::new(len - rest.len());
        return Err(nom::Err::Failure(BerError::Incomplete(needed)));
    }
    fn ia5str<'a>(i: &'a [u8], hdr: Header) -> Result<&'a str, Err<BerError>> {
        // Relax constraints from RFC here: we are expecting an IA5String, but many certificates
        // are using unicode characters
        der_read_element_content_as(i, Tag::Utf8String, hdr.length(), hdr.is_constructed(), 1)?
            .1
            .as_slice()
            .and_then(|s| std::str::from_utf8(s).map_err(|_| BerError::BerValueError))
            .map_err(nom::Err::Failure)
    }
    let name = match hdr.tag().0 {
        0 => {
            // otherName SEQUENCE { OID, [0] explicit any defined by oid }
            let (any, oid) = parse_der_oid(rest)?;
            let oid = oid.as_oid_val().map_err(nom::Err::Failure)?;
            GeneralName::OtherName(oid, any)
        }
        1 => GeneralName::RFC822Name(ia5str(rest, hdr)?),
        2 => GeneralName::DNSName(ia5str(rest, hdr)?),
        3 => {
            // XXX Not yet implemented
            let (_, data) = take(len)(rest)?;
            let obj = UnparsedObject { header: hdr, data };
            GeneralName::X400Address(obj)
        }
        4 => {
            // directoryName, name
            let (_, name) = all_consuming(X509Name::from_der)(&rest[..len])
                .or(Err(BerError::Unsupported)) // XXX remove me
                ?;
            GeneralName::DirectoryName(name)
        }
        5 => {
            // XXX Not yet implemented
            let (_, data) = take(len)(rest)?;
            let obj = UnparsedObject { header: hdr, data };
            GeneralName::EDIPartyName(obj)
        }
        6 => GeneralName::URI(ia5str(rest, hdr)?),
        7 => {
            // IPAddress, OctetString
            let ip = der_read_element_content_as(
                rest,
                Tag::OctetString,
                hdr.length(),
                hdr.is_constructed(),
                1,
            )?
            .1
            .as_slice()
            .map_err(nom::Err::Failure)?;
            GeneralName::IPAddress(ip)
        }
        8 => {
            let oid =
                der_read_element_content_as(rest, Tag::Oid, hdr.length(), hdr.is_constructed(), 1)?
                    .1
                    .as_oid_val()
                    .map_err(nom::Err::Failure)?;
            GeneralName::RegisteredID(oid)
        }
        _ => return Err(Err::Failure(BerError::unexpected_tag(None, hdr.tag()))),
    };
    Ok((&rest[len..], name))
}