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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
//! User Attribute packets and subpackets.
//!
//! See [Section 5.12 of RFC 4880] for details.
//!
//!   [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12

use std::fmt;
use quickcheck::{Arbitrary, Gen};
use rand::Rng;

use buffered_reader::BufferedReader;

use Error;
use Result;
use packet::{
    self,
    BodyLength,
};
use Packet;
use serialize::Serialize;
use serialize::SerializeInto;

/// Holds a UserAttribute packet.
///
/// See [Section 5.12 of RFC 4880] for details.
///
///   [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12
#[derive(PartialEq, Eq, Hash, Clone)]
pub struct UserAttribute {
    /// CTB packet header fields.
    pub(crate) common: packet::Common,

    /// The user attribute.
    value: Vec<u8>,
}

impl From<Vec<u8>> for UserAttribute {
    fn from(u: Vec<u8>) -> Self {
        UserAttribute {
            common: Default::default(),
            value: u,
        }
    }
}

impl fmt::Debug for UserAttribute {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        f.debug_struct("UserAttribute")
            .field("value (bytes)", &self.value.len())
            .finish()
    }
}

impl UserAttribute {
    /// Returns a new `UserAttribute` packet.
    ///
    /// Note: a valid UserAttribute has at least one subpacket.
    pub fn new(subpackets: &[Subpacket]) -> Result<Self> {
        let mut value = Vec::with_capacity(
            subpackets.iter().fold(0, |l, s| l + s.serialized_len()));
        for s in subpackets {
            s.serialize(&mut value)?
        }

        Ok(UserAttribute {
            common: Default::default(),
            value
        })
    }

    /// Gets the user attribute packet's raw, unparsed value.
    ///
    /// Most likely you will want to use [`subpackets()`] to iterate
    /// over the subpackets.
    ///
    /// [`subpackets()`]: #method.subpackets
    pub fn value(&self) -> &[u8] {
        self.value.as_slice()
    }

    /// Gets a mutable reference to the user attribute packet's raw
    /// value.
    pub fn value_mut(&mut self) -> &mut Vec<u8> {
        &mut self.value
    }

    /// Iterates over the subpackets.
    pub fn subpackets(&self) -> SubpacketIterator {
        SubpacketIterator {
            reader: buffered_reader::Memory::new(&self.value[..]),
        }
    }
}

impl From<UserAttribute> for Packet {
    fn from(s: UserAttribute) -> Self {
        Packet::UserAttribute(s)
    }
}

impl Arbitrary for UserAttribute {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        UserAttribute::new(
            &(0..g.gen_range(1, 10))
                .map(|_| Subpacket::arbitrary(g))
                .collect::<Vec<_>>()[..]).unwrap()
    }
}

/// Iterates over subpackets.
pub struct SubpacketIterator<'a> {
    reader: buffered_reader::Memory<'a, ()>,
}

impl<'a> Iterator for SubpacketIterator<'a> {
    type Item = Result<Subpacket>;
    fn next(&mut self) -> Option<Self::Item> {
        let length = match BodyLength::parse_new_format(&mut self.reader) {
            Ok(BodyLength::Full(l)) => l,
            Ok(BodyLength::Partial(_)) | Ok(BodyLength::Indeterminate) =>
                return Some(Err(Error::MalformedPacket(
                    "Partial or Indeterminate length of subpacket".into())
                                .into())),
            Err(e) =>
                if e.kind() == ::std::io::ErrorKind::UnexpectedEof {
                    return None;
                } else {
                    return Some(Err(e.into()));
                },
        };

        let raw = match self.reader.data_consume_hard(length as usize) {
            Ok(r) => &r[..length as usize],
            Err(e) => return Some(Err(e.into())),
        };

        if raw.len() == 0 {
            return Some(Err(Error::MalformedPacket(
                "Subpacket without type octet".into()).into()));
        }

        let typ = raw[0];
        let raw = &raw[1..];
        match typ {
            // Image.
            1 => if raw.len() >= 16 &&
                    &raw[..3] == &[0x10, 0x00, 0x01]
                    && raw[4..16].iter().all(|b| *b == 0)
            {
                let image_kind = raw[3];
                Some(Ok(Subpacket::Image(match image_kind {
                    1 =>
                        Image::JPEG(Vec::from(&raw[16..]).into_boxed_slice()),
                    n @ 100...110 =>
                        Image::Private(
                            n, Vec::from(&raw[16..]).into_boxed_slice()),
                    n =>
                        Image::Unknown(
                            n, Vec::from(&raw[16..]).into_boxed_slice()),
                })))
            } else {
                Some(Err(Error::MalformedPacket(
                    "Malformed image subpacket".into()).into()))
            },
            n =>
                Some(Ok(Subpacket::Unknown(
                    n, Vec::from(raw).into_boxed_slice()))),
        }
    }
}

/// User Attribute subpackets.
///
/// See [Section 5.12 of RFC 4880] for details.
///
///   [Section 5.12 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum Subpacket {
    /// Image subpacket.
    ///
    /// See [Section 5.12.1 of RFC 4880] for details.
    ///
    ///   [Section 5.12.1 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12.1
    Image(Image),
    /// Unknown subpacket.
    Unknown(u8, Box<[u8]>),
}

impl Arbitrary for Subpacket {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        match g.gen_range(0, 2) {
            0 => Subpacket::Image(Image::arbitrary(g)),
            1 => Subpacket::Unknown(
                g.gen_range(1, 256) as u8,
                Vec::<u8>::arbitrary(g).into_boxed_slice()
            ),
            _ => unreachable!(),
        }
    }
}

/// Image subpacket.
///
/// See [Section 5.12.1 of RFC 4880] for details.
///
///   [Section 5.12.1 of RFC 4880]: https://tools.ietf.org/html/rfc4880#section-5.12.1
#[derive(Clone, Debug, PartialEq, Eq, Hash)]
pub enum Image {
    /// A JPEG image format.
    JPEG(Box<[u8]>),
    /// Private, experimental image format.
    Private(u8, Box<[u8]>),
    /// Unknown image format.
    Unknown(u8, Box<[u8]>),
}

impl Arbitrary for Image {
    fn arbitrary<G: Gen>(g: &mut G) -> Self {
        match g.gen_range(0, 3) {
            0 =>
                Image::JPEG(
                    Vec::<u8>::arbitrary(g).into_boxed_slice()
                ),
            1 =>
                Image::Unknown(
                    g.gen_range(1, 100),
                    Vec::<u8>::arbitrary(g).into_boxed_slice()
                ),
            2 =>
                Image::Private(
                    g.gen_range(100, 111),
                    Vec::<u8>::arbitrary(g).into_boxed_slice()
                ),
            _ => unreachable!(),
        }
    }
}


#[cfg(test)]
mod tests {
    use super::*;
    use parse::Parse;
    use serialize::SerializeInto;

    quickcheck! {
        fn roundtrip(p: UserAttribute) -> bool {
            let q = UserAttribute::from_bytes(&p.to_vec().unwrap()).unwrap();
            assert_eq!(p, q);
            true
        }
    }

    #[test]
    fn image() {
        use Packet;
        let p = Packet::from_bytes(b"
-----BEGIN PGP ARMORED FILE-----

0cFuwWwBEAABAQAAAAAAAAAAAAAAAP/Y/+AAEEpGSUYAAQEBASwBLAAA//4AE0Ny
ZWF0ZWQgd2l0aCBHSU1Q/9sAQwADAgIDAgIDAwMDBAMDBAUIBQUEBAUKBwcGCAwK
DAwLCgsLDQ4SEA0OEQ4LCxAWEBETFBUVFQwPFxgWFBgSFBUU/9sAQwEDBAQFBAUJ
BQUJFA0LDRQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQUFBQU
FBQUFBQUFBQU/8IAEQgAAQABAwERAAIRAQMRAf/EABQAAQAAAAAAAAAAAAAAAAAA
AAj/xAAUAQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIQAxAAAAFUn//EABQQAQAA
AAAAAAAAAAAAAAAAAAD/2gAIAQEAAQUCf//EABQRAQAAAAAAAAAAAAAAAAAAAAD/
2gAIAQMBAT8Bf//EABQRAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQIBAT8Bf//EABQQ
AQAAAAAAAAAAAAAAAAAAAAD/2gAIAQEABj8Cf//EABQQAQAAAAAAAAAAAAAAAAAA
AAD/2gAIAQEAAT8hf//aAAwDAQACAAMAAAAQn//EABQRAQAAAAAAAAAAAAAAAAAA
AAD/2gAIAQMBAT8Qf//EABQRAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQIBAT8Qf//E
ABQQAQAAAAAAAAAAAAAAAAAAAAD/2gAIAQEAAT8Qf//Z
=nUQg
-----END PGP ARMORED FILE-----
").unwrap();
        let subpackets: Vec<_> = if let Packet::UserAttribute(ua) = p {
            ua.subpackets().collect()
        } else {
            panic!("Expected an UserAttribute, got: {:?}", p);
        };
        assert_eq!(subpackets.len(), 1);
        if let Ok(Subpacket::Image(Image::JPEG(img))) = &subpackets[0] {
            assert_eq!(img.len(), 539);
            assert_eq!(&img[6..10], b"JFIF");
            assert_eq!(&img[24..41], b"Created with GIMP");
        } else {
            panic!("Expected JPEG, got {:?}", &subpackets[0]);
        }
    }
}