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
|
//! Test implementation for X.509
//!
//! This is mostly used to verify that required types and functions are implemented,
//! and that provided API is convenient.
use asn1_rs::{
nom, Any, CheckDerConstraints, Choice, Error, FromBer, FromDer, Oid, ParseResult, Sequence,
SetOf, Tag, Tagged,
};
use hex_literal::hex;
use nom::sequence::pair;
use std::convert::{TryFrom, TryInto};
const DN: &[u8] = &hex!(
"
30 45 31 0b 30 09 06 03 55 04 06 13 02 46 52
31 13 30 11 06 03 55 04 08 0c 0a 53 6f 6d 65
2d 53 74 61 74 65 31 21 30 1f 06 03 55 04 0a
0c 18 49 6e 74 65 72 6e 65 74 20 57 69 64 67
69 74 73 20 50 74 79 20 4c 74 64
"
);
// Name ::= CHOICE { -- only one possibility for now --
// rdnSequence RDNSequence }
// RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
#[derive(Debug)]
pub struct Name<'a> {
pub rdn_sequence: Vec<RelativeDistinguishedName<'a>>,
}
impl<'a> FromDer<'a> for Name<'a> {
fn from_der(bytes: &'a [u8]) -> ParseResult<'a, Self> {
let (rem, rdn_sequence) = <Vec<RelativeDistinguishedName>>::from_der(bytes)?;
let dn = Name { rdn_sequence };
Ok((rem, dn))
}
}
// RelativeDistinguishedName ::=
// SET SIZE (1..MAX) OF AttributeTypeAndValue
#[derive(Debug)]
pub struct RelativeDistinguishedName<'a> {
pub v: Vec<AttributeTypeAndValue<'a>>,
}
impl<'a> FromDer<'a> for RelativeDistinguishedName<'a> {
fn from_der(bytes: &'a [u8]) -> ParseResult<'a, Self> {
let (rem, set) = SetOf::<AttributeTypeAndValue>::from_der(bytes)?;
let v: Vec<_> = set.into();
if v.is_empty() {
return Err(nom::Err::Failure(Error::InvalidLength));
}
Ok((rem, RelativeDistinguishedName { v }))
}
}
// AttributeTypeAndValue ::= SEQUENCE {
// type AttributeType,
// value AttributeValue }
#[derive(Debug)]
pub struct AttributeTypeAndValue<'a> {
pub oid: Oid<'a>,
pub value: AttributeValue<'a>,
}
impl<'a> FromBer<'a> for AttributeTypeAndValue<'a> {
fn from_ber(bytes: &'a [u8]) -> ParseResult<'a, Self> {
let (rem, seq) = Sequence::from_der(bytes)?;
let (_, (oid, value)) =
seq.parse_into(|i| pair(Oid::from_der, AttributeValue::from_der)(i))?;
let attr = AttributeTypeAndValue { oid, value };
Ok((rem, attr))
}
}
impl<'a> FromDer<'a> for AttributeTypeAndValue<'a> {
fn from_der(bytes: &'a [u8]) -> ParseResult<'a, Self> {
let (rem, seq) = Sequence::from_der(bytes)?;
let (_, (oid, value)) =
seq.parse_into(|i| pair(Oid::from_der, AttributeValue::from_der)(i))?;
let attr = AttributeTypeAndValue { oid, value };
Ok((rem, attr))
}
}
impl<'a> CheckDerConstraints for AttributeTypeAndValue<'a> {
fn check_constraints(any: &Any) -> asn1_rs::Result<()> {
any.tag().assert_eq(Sequence::TAG)?;
Ok(())
}
}
// AttributeType ::= OBJECT IDENTIFIER
// AttributeValue ::= ANY -- DEFINED BY AttributeType
#[derive(Debug)]
pub enum AttributeValue<'a> {
DirectoryString(DirectoryString),
Other(Any<'a>),
}
impl<'a> FromDer<'a> for AttributeValue<'a> {
fn from_der(bytes: &'a [u8]) -> ParseResult<'a, Self> {
let (rem, any) = Any::from_der(bytes)?;
let ds = if DirectoryString::can_decode(any.tag()) {
AttributeValue::DirectoryString(any.try_into()?)
} else {
AttributeValue::Other(any)
};
Ok((rem, ds))
}
}
// DirectoryString ::= CHOICE {
// teletexString TeletexString (SIZE (1..MAX)),
// printableString PrintableString (SIZE (1..MAX)),
// universalString UniversalString (SIZE (1..MAX)),
// utf8String UTF8String (SIZE (1..MAX)),
// bmpString BMPString (SIZE (1..MAX)) }
#[derive(Debug)]
pub enum DirectoryString {
Printable(String),
Utf8(String),
}
impl Choice for DirectoryString {
fn can_decode(tag: Tag) -> bool {
matches!(tag, Tag::PrintableString | Tag::Utf8String)
}
}
impl<'a> TryFrom<Any<'a>> for DirectoryString {
type Error = Error;
fn try_from(any: Any<'a>) -> Result<Self, Self::Error> {
match any.tag() {
Tag::PrintableString => {
let s = any.printablestring()?;
Ok(DirectoryString::Printable(s.string()))
}
Tag::Utf8String => {
let s = any.string()?;
Ok(DirectoryString::Utf8(s))
}
_ => Err(Error::InvalidTag),
}
}
}
#[test]
fn x509_decode_dn() {
let (rem, dn) = Name::from_der(DN).expect("parsing failed");
assert!(rem.is_empty());
// dbg!(&dn);
assert_eq!(dn.rdn_sequence.len(), 3);
}
|
