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
//! Verify and deserialize Detached-Jws use anyhow::{bail, Context, Result}; use base64::{read::DecoderReader, write::EncoderWriter}; use serde_json::{Map, Value}; use std::io::{Read, Write}; use crate::Verify; type JwsHeader = Map<String, Value>; static DOT_BYTE: u8 = b'.'; /// Deserialize and verify detached jws /// /// # Examples /// /// ``` /// extern crate detached_jws; /// extern crate anyhow; /// extern crate serde_json; /// /// use std::io::{Write}; /// use anyhow::Result; /// use serde_json::{Map, Value}; /// use detached_jws::{Verify}; /// ///#[derive(Default)] /// pub struct DummyVerifier; /// /// impl Verify for DummyVerifier { /// fn verify(&self, signature: &[u8]) -> Result<bool> { /// Ok(true) /// } /// } /// /// impl Write for DummyVerifier { /// fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { /// Ok(buf.len()) /// } /// fn flush(&mut self) -> std::io::Result<()> { /// Ok(()) /// } /// } /// /// let jws = "eyJhbGciOiJ0ZXN0X2FsZ29yaXRobSIsImN1c3RvbSI6ImN1c3RvbV92YWx1ZSJ9..ZXlKaGJHY2lPaUowWlhOMFgyRnNaMjl5YVhSb2JTSXNJbU4xYzNSdmJTSTZJbU4xYzNSdmJWOTJZV3gxWlNKOS5BQUVDQXdRRkJn".as_bytes(); /// /// let verified_headers = detached_jws::deserialize_selector( /// &jws, /// &mut vec![0, 1, 2, 3, 4, 5, 6].as_slice(), /// |h| { /// match h.get("alg").unwrap() { /// Value::String(ref v) if v == "test_algorithm" => Some(DummyVerifier::default()), /// _ => None, /// } /// }).unwrap(); /// /// assert_eq!( /// verified_headers.get("custom").unwrap().as_str().unwrap(), /// "custom_value" /// ); /// ``` pub fn deserialize_selector<F, V>( jws: &impl AsRef<[u8]>, payload: &mut impl Read, selector: F, ) -> Result<JwsHeader> where F: Fn(&JwsHeader) -> Option<V>, V: Verify, { let mut writer = DeserializeJwsWriter::new(jws, selector)?; std::io::copy(payload, &mut writer)?; writer.finish() } /// Deserialize and verify detached jws. /// /// # Examples /// /// ``` /// extern crate detached_jws; /// extern crate anyhow; /// extern crate serde_json; /// /// use std::io::{Write}; /// use anyhow::Result; /// use serde_json::{Map}; /// use detached_jws::{Verify}; /// ///#[derive(Default)] /// pub struct DummyVerifier; /// /// impl Verify for DummyVerifier { /// fn verify(&self, signature: &[u8]) -> Result<bool> { /// Ok(true) /// } /// } /// /// impl Write for DummyVerifier { /// fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { /// Ok(buf.len()) /// } /// fn flush(&mut self) -> std::io::Result<()> { /// Ok(()) /// } /// } /// /// let detached_jws = "eyJhbGciOiJ0ZXN0X2FsZ29yaXRobSIsImN1c3RvbSI6ImN1c3RvbV92YWx1ZSJ9..ZXlKaGJHY2lPaUowWlhOMFgyRnNaMjl5YVhSb2JTSXNJbU4xYzNSdmJTSTZJbU4xYzNSdmJWOTJZV3gxWlNKOS5BQUVDQXdRRkJn".as_bytes(); /// /// let verified_headers = detached_jws::deserialize( /// &detached_jws, /// &mut vec![0, 1, 2, 3, 4, 5, 6].as_slice(), /// DummyVerifier::default()).unwrap(); /// /// assert_eq!( /// verified_headers.get("custom").unwrap().as_str().unwrap(), /// "custom_value" /// ); /// ``` pub fn deserialize<V>( jws: &impl AsRef<[u8]>, payload: &mut impl Read, verifier: V, ) -> Result<JwsHeader> where V: Verify, { let mut writer = DeserializeJwsWriter::new(jws, move |_| Some(verifier))?; std::io::copy(payload, &mut writer)?; writer.finish() } /// A `Write` implementation deserialize and verify detached jws /// /// # Examples /// /// ``` /// extern crate detached_jws; /// extern crate anyhow; /// extern crate serde_json; /// /// use std::io::{Write}; /// use anyhow::Result; /// use serde_json::{Map, Value}; /// use detached_jws::{Verify, DeserializeJwsWriter}; /// ///#[derive(Default)] /// pub struct DummyVerifier; /// /// impl Verify for DummyVerifier { /// fn verify(&self, signature: &[u8]) -> Result<bool> { /// Ok(true) /// } /// } /// /// impl Write for DummyVerifier { /// fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { /// Ok(buf.len()) /// } /// fn flush(&mut self) -> std::io::Result<()> { /// Ok(()) /// } /// } /// /// let jws = "eyJhbGciOiJ0ZXN0X2FsZ29yaXRobSIsImN1c3RvbSI6ImN1c3RvbV92YWx1ZSJ9..ZXlKaGJHY2lPaUowWlhOMFgyRnNaMjl5YVhSb2JTSXNJbU4xYzNSdmJTSTZJbU4xYzNSdmJWOTJZV3gxWlNKOS5BQUVDQXdRRkJn".as_bytes(); /// /// let mut writer = DeserializeJwsWriter::new(&jws, /// |h| Some(DummyVerifier::default()) /// ).unwrap(); /// writer.write_all(&[0, 1, 2, 3]); /// writer.write_all(&[4, 5, 6]); /// /// let verified_headers = writer.finish().unwrap(); /// /// assert_eq!( /// verified_headers.get("custom").unwrap().as_str().unwrap(), /// "custom_value" /// ); /// ``` pub struct DeserializeJwsWriter<V: Write> { encoder: EncoderWriter<V>, header: Option<JwsHeader>, signature: Vec<u8>, } impl<V> DeserializeJwsWriter<V> where V: Verify, { pub fn new<S>(jws: &impl AsRef<[u8]>, selector: S) -> Result<Self> where S: FnOnce(&JwsHeader) -> Option<V>, { let input = jws.as_ref(); let mut splits = input.split(|e| e == &DOT_BYTE); let encoded_header = splits.next().context("wrong jws format")?.to_vec(); let header = { let mut slice = encoded_header.as_slice(); let decoder = DecoderReader::new(&mut slice, base64::URL_SAFE_NO_PAD); serde_json::from_reader(decoder).context("wrong jws header format")? }; let mut splits = splits.skip(1); //detached payload skip let signature = { let mut part3 = splits.next().context("wrong jws format")?; base64::decode_config(&mut part3, base64::URL_SAFE_NO_PAD) .context("wrong jws signature format")? }; let mut verifier = selector(&header).context("verifier is not found")?; verifier.write_all(encoded_header.as_slice())?; verifier.write_all(&[DOT_BYTE])?; Ok(Self { encoder: EncoderWriter::new(verifier, base64::URL_SAFE_NO_PAD), header: Some(header), signature: signature, }) } pub fn finish(&mut self) -> Result<JwsHeader> { if self.header.is_none() { bail!("Derializer has already had finish() called") }; let verifier = self.encoder.finish()?; match verifier.verify(&self.signature)? { true => Ok(self.header.take().unwrap()), false => bail!("incorrect signature"), } } } impl<V> Write for DeserializeJwsWriter<V> where V: Verify, { fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> { self.encoder.write(buf) } fn flush(&mut self) -> std::io::Result<()> { self.encoder.flush() } }