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
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
/*
* Copyright (c) 2020-2023, Stalwart Labs Ltd.
*
* Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
* https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
* <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
* option. This file may not be copied, modified, or distributed
* except according to those terms.
*/
use mail_parser::{parsers::MessageStream, Address, HeaderValue};
use crate::{arc, common::crypto::HashAlgorithm, dkim, AuthenticatedMessage};
use super::headers::{AuthenticatedHeader, Header, HeaderParser};
impl<'x> AuthenticatedMessage<'x> {
pub fn parse(raw_message: &'x [u8]) -> Option<Self> {
Self::parse_with_opts(raw_message, true)
}
pub fn parse_with_opts(raw_message: &'x [u8], strict: bool) -> Option<Self> {
let mut message = AuthenticatedMessage {
headers: Vec::new(),
from: Vec::new(),
raw_message,
body_offset: 0,
body_hashes: Vec::new(),
dkim_headers: Vec::new(),
ams_headers: Vec::new(),
as_headers: Vec::new(),
aar_headers: Vec::new(),
received_headers_count: 0,
date_header_present: false,
message_id_header_present: false,
};
let mut headers = HeaderParser::new(raw_message);
let mut has_arc_errors = false;
for (header, value) in &mut headers {
let name =
match header {
AuthenticatedHeader::Ds(name) => {
let signature = match dkim::Signature::parse(value) {
Ok(signature) if signature.l == 0 || !strict => {
let ha = HashAlgorithm::from(signature.a);
if !message.body_hashes.iter().any(|(c, h, l, _)| {
c == &signature.cb && h == &ha && l == &signature.l
}) {
message.body_hashes.push((
signature.cb,
ha,
signature.l,
Vec::new(),
));
}
Ok(signature)
}
Ok(_) => Err(crate::Error::SignatureLength),
Err(err) => Err(err),
};
message
.dkim_headers
.push(Header::new(name, value, signature));
name
}
AuthenticatedHeader::Aar(name) => {
let results = arc::Results::parse(value);
if !has_arc_errors {
has_arc_errors = results.is_err();
}
message.aar_headers.push(Header::new(name, value, results));
name
}
AuthenticatedHeader::Ams(name) => {
let signature = match arc::Signature::parse(value) {
Ok(signature) if signature.l == 0 || !strict => {
let ha = HashAlgorithm::from(signature.a);
if !message.body_hashes.iter().any(|(c, h, l, _)| {
c == &signature.cb && h == &ha && l == &signature.l
}) {
message.body_hashes.push((
signature.cb,
ha,
signature.l,
Vec::new(),
));
}
Ok(signature)
}
Ok(_) => {
has_arc_errors = true;
Err(crate::Error::SignatureLength)
}
Err(err) => {
has_arc_errors = true;
Err(err)
}
};
message
.ams_headers
.push(Header::new(name, value, signature));
name
}
AuthenticatedHeader::As(name) => {
let seal = arc::Seal::parse(value);
if !has_arc_errors {
has_arc_errors = seal.is_err();
}
message.as_headers.push(Header::new(name, value, seal));
name
}
AuthenticatedHeader::From(name) => {
match MessageStream::new(value).parse_address() {
HeaderValue::Address(Address::List(list)) => {
message.from.extend(
list.into_iter()
.filter_map(|a| a.address.map(|a| a.to_lowercase())),
);
}
HeaderValue::Address(Address::Group(group_list)) => message
.from
.extend(group_list.into_iter().flat_map(|group| {
group
.addresses
.into_iter()
.filter_map(|a| a.address.map(|a| a.to_lowercase()))
})),
_ => (),
}
name
}
AuthenticatedHeader::Other(name) => name,
};
message.headers.push((name, value));
}
if message.headers.is_empty() {
return None;
}
// Update header counts
message.received_headers_count = headers.num_received;
message.message_id_header_present = headers.has_message_id;
message.date_header_present = headers.has_date;
// Obtain message body
if let Some(offset) = headers.body_offset() {
message.body_offset = offset;
} else {
message.body_offset = raw_message.len();
}
let body = raw_message.get(message.body_offset..).unwrap_or_default();
// Calculate body hashes
for (cb, ha, l, bh) in &mut message.body_hashes {
*bh = ha.hash(cb.canonical_body(body, *l)).as_ref().to_vec();
}
// Sort ARC headers
if !message.as_headers.is_empty() && !has_arc_errors {
message.as_headers.sort_unstable_by(|a, b| {
a.header
.as_ref()
.unwrap()
.i
.cmp(&b.header.as_ref().unwrap().i)
});
message.ams_headers.sort_unstable_by(|a, b| {
a.header
.as_ref()
.unwrap()
.i
.cmp(&b.header.as_ref().unwrap().i)
});
message.aar_headers.sort_unstable_by(|a, b| {
a.header
.as_ref()
.unwrap()
.i
.cmp(&b.header.as_ref().unwrap().i)
});
}
message.into()
}
pub fn received_headers_count(&self) -> usize {
self.received_headers_count
}
pub fn has_message_id_header(&self) -> bool {
self.message_id_header_present
}
pub fn has_date_header(&self) -> bool {
self.date_header_present
}
pub fn raw_message(&self) -> &[u8] {
self.raw_message
}
pub fn raw_headers(&self) -> &[u8] {
self.raw_message.get(..self.body_offset).unwrap_or_default()
}
pub fn raw_parsed_headers(&self) -> &[(&[u8], &[u8])] {
&self.headers
}
pub fn raw_body(&self) -> &[u8] {
self.raw_message.get(self.body_offset..).unwrap_or_default()
}
pub fn body_offset(&self) -> usize {
self.body_offset
}
pub fn froms(&self) -> &[String] {
&self.from
}
pub fn from(&self) -> &str {
self.from.first().map_or("", |f| f.as_str())
}
}