Line data Source code
1 : // For details about authentication see docs/authentication.md
2 :
3 : use arc_swap::ArcSwap;
4 : use serde;
5 : use std::{borrow::Cow, fmt::Display, fs, sync::Arc};
6 :
7 : use anyhow::Result;
8 : use camino::Utf8Path;
9 : use jsonwebtoken::{
10 : decode, encode, Algorithm, DecodingKey, EncodingKey, Header, TokenData, Validation,
11 : };
12 : use serde::{Deserialize, Serialize};
13 :
14 : use crate::{http::error::ApiError, id::TenantId};
15 :
16 : /// Algorithm to use. We require EdDSA.
17 : const STORAGE_TOKEN_ALGORITHM: Algorithm = Algorithm::EdDSA;
18 :
19 804 : #[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq)]
20 : #[serde(rename_all = "lowercase")]
21 : pub enum Scope {
22 : // Provides access to all data for a specific tenant (specified in `struct Claims` below)
23 : // TODO: join these two?
24 : Tenant,
25 : // Provides blanket access to all tenants on the pageserver plus pageserver-wide APIs.
26 : // Should only be used e.g. for status check/tenant creation/list.
27 : PageServerApi,
28 : // Provides blanket access to all data on the safekeeper plus safekeeper-wide APIs.
29 : // Should only be used e.g. for status check.
30 : // Currently also used for connection from any pageserver to any safekeeper.
31 : SafekeeperData,
32 : }
33 :
34 : /// JWT payload. See docs/authentication.md for the format
35 1952 : #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
36 : pub struct Claims {
37 : #[serde(default)]
38 : pub tenant_id: Option<TenantId>,
39 : pub scope: Scope,
40 : }
41 :
42 : impl Claims {
43 184 : pub fn new(tenant_id: Option<TenantId>, scope: Scope) -> Self {
44 184 : Self { tenant_id, scope }
45 184 : }
46 : }
47 :
48 : pub struct SwappableJwtAuth(ArcSwap<JwtAuth>);
49 :
50 : impl SwappableJwtAuth {
51 42 : pub fn new(jwt_auth: JwtAuth) -> Self {
52 42 : SwappableJwtAuth(ArcSwap::new(Arc::new(jwt_auth)))
53 42 : }
54 6 : pub fn swap(&self, jwt_auth: JwtAuth) {
55 6 : self.0.swap(Arc::new(jwt_auth));
56 6 : }
57 275 : pub fn decode(&self, token: &str) -> std::result::Result<TokenData<Claims>, AuthError> {
58 275 : self.0.load().decode(token)
59 275 : }
60 : }
61 :
62 : impl std::fmt::Debug for SwappableJwtAuth {
63 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
64 0 : write!(f, "Swappable({:?})", self.0.load())
65 0 : }
66 : }
67 :
68 0 : #[derive(Clone, PartialEq, Eq, Hash, Debug)]
69 : pub struct AuthError(pub Cow<'static, str>);
70 :
71 : impl Display for AuthError {
72 3 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
73 3 : write!(f, "{}", self.0)
74 3 : }
75 : }
76 :
77 : impl From<AuthError> for ApiError {
78 3 : fn from(_value: AuthError) -> Self {
79 3 : // Don't pass on the value of the AuthError as a precautionary measure.
80 3 : // Being intentionally vague in public error communication hurts debugability
81 3 : // but it is more secure.
82 3 : ApiError::Forbidden("JWT authentication error".to_string())
83 3 : }
84 : }
85 :
86 : pub struct JwtAuth {
87 : decoding_keys: Vec<DecodingKey>,
88 : validation: Validation,
89 : }
90 :
91 : impl JwtAuth {
92 95 : pub fn new(decoding_keys: Vec<DecodingKey>) -> Self {
93 95 : let mut validation = Validation::default();
94 95 : validation.algorithms = vec![STORAGE_TOKEN_ALGORITHM];
95 95 : // The default 'required_spec_claims' is 'exp'. But we don't want to require
96 95 : // expiration.
97 95 : validation.required_spec_claims = [].into();
98 95 : Self {
99 95 : decoding_keys,
100 95 : validation,
101 95 : }
102 95 : }
103 :
104 80 : pub fn from_key_path(key_path: &Utf8Path) -> Result<Self> {
105 80 : let metadata = key_path.metadata()?;
106 80 : let decoding_keys = if metadata.is_dir() {
107 2 : let mut keys = Vec::new();
108 3 : for entry in fs::read_dir(key_path)? {
109 3 : let path = entry?.path();
110 3 : if !path.is_file() {
111 : // Ignore directories (don't recurse)
112 0 : continue;
113 3 : }
114 3 : let public_key = fs::read(path)?;
115 3 : keys.push(DecodingKey::from_ed_pem(&public_key)?);
116 : }
117 2 : keys
118 78 : } else if metadata.is_file() {
119 78 : let public_key = fs::read(key_path)?;
120 78 : vec![DecodingKey::from_ed_pem(&public_key)?]
121 : } else {
122 0 : anyhow::bail!("path is neither a directory or a file")
123 : };
124 80 : if decoding_keys.is_empty() {
125 0 : anyhow::bail!("Configured for JWT auth with zero decoding keys. All JWT gated requests would be rejected.");
126 80 : }
127 80 : Ok(Self::new(decoding_keys))
128 80 : }
129 :
130 11 : pub fn from_key(key: String) -> Result<Self> {
131 11 : Ok(Self::new(vec![DecodingKey::from_ed_pem(key.as_bytes())?]))
132 11 : }
133 :
134 : /// Attempt to decode the token with the internal decoding keys.
135 : ///
136 : /// The function tries the stored decoding keys in succession,
137 : /// and returns the first yielding a successful result.
138 : /// If there is no working decoding key, it returns the last error.
139 405 : pub fn decode(&self, token: &str) -> std::result::Result<TokenData<Claims>, AuthError> {
140 405 : let mut res = None;
141 410 : for decoding_key in &self.decoding_keys {
142 407 : res = Some(decode(token, decoding_key, &self.validation));
143 407 : if let Some(Ok(res)) = res {
144 402 : return Ok(res);
145 5 : }
146 : }
147 3 : if let Some(res) = res {
148 3 : res.map_err(|e| AuthError(Cow::Owned(e.to_string())))
149 : } else {
150 0 : Err(AuthError(Cow::Borrowed("no JWT decoding keys configured")))
151 : }
152 405 : }
153 : }
154 :
155 : impl std::fmt::Debug for JwtAuth {
156 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
157 0 : f.debug_struct("JwtAuth")
158 0 : .field("validation", &self.validation)
159 0 : .finish()
160 0 : }
161 : }
162 :
163 : // this function is used only for testing purposes in CLI e g generate tokens during init
164 186 : pub fn encode_from_key_file(claims: &Claims, key_data: &[u8]) -> Result<String> {
165 186 : let key = EncodingKey::from_ed_pem(key_data)?;
166 186 : Ok(encode(&Header::new(STORAGE_TOKEN_ALGORITHM), claims, &key)?)
167 186 : }
168 :
169 : #[cfg(test)]
170 : mod tests {
171 : use super::*;
172 : use std::str::FromStr;
173 :
174 : // Generated with:
175 : //
176 : // openssl genpkey -algorithm ed25519 -out ed25519-priv.pem
177 : // openssl pkey -in ed25519-priv.pem -pubout -out ed25519-pub.pem
178 : const TEST_PUB_KEY_ED25519: &[u8] = br#"
179 : -----BEGIN PUBLIC KEY-----
180 : MCowBQYDK2VwAyEARYwaNBayR+eGI0iXB4s3QxE3Nl2g1iWbr6KtLWeVD/w=
181 : -----END PUBLIC KEY-----
182 : "#;
183 :
184 : const TEST_PRIV_KEY_ED25519: &[u8] = br#"
185 : -----BEGIN PRIVATE KEY-----
186 : MC4CAQAwBQYDK2VwBCIEID/Drmc1AA6U/znNRWpF3zEGegOATQxfkdWxitcOMsIH
187 : -----END PRIVATE KEY-----
188 : "#;
189 :
190 2 : #[test]
191 2 : fn test_decode() {
192 2 : let expected_claims = Claims {
193 2 : tenant_id: Some(TenantId::from_str("3d1f7595b468230304e0b73cecbcb081").unwrap()),
194 2 : scope: Scope::Tenant,
195 2 : };
196 2 :
197 2 : // A test token containing the following payload, signed using TEST_PRIV_KEY_ED25519:
198 2 : //
199 2 : // ```
200 2 : // {
201 2 : // "scope": "tenant",
202 2 : // "tenant_id": "3d1f7595b468230304e0b73cecbcb081",
203 2 : // "iss": "neon.controlplane",
204 2 : // "exp": 1709200879,
205 2 : // "iat": 1678442479
206 2 : // }
207 2 : // ```
208 2 : //
209 2 : let encoded_eddsa = "eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJzY29wZSI6InRlbmFudCIsInRlbmFudF9pZCI6IjNkMWY3NTk1YjQ2ODIzMDMwNGUwYjczY2VjYmNiMDgxIiwiaXNzIjoibmVvbi5jb250cm9scGxhbmUiLCJleHAiOjE3MDkyMDA4NzksImlhdCI6MTY3ODQ0MjQ3OX0.U3eA8j-uU-JnhzeO3EDHRuXLwkAUFCPxtGHEgw6p7Ccc3YRbFs2tmCdbD9PZEXP-XsxSeBQi1FY0YPcT3NXADw";
210 2 :
211 2 : // Check it can be validated with the public key
212 2 : let auth = JwtAuth::new(vec![DecodingKey::from_ed_pem(TEST_PUB_KEY_ED25519).unwrap()]);
213 2 : let claims_from_token = auth.decode(encoded_eddsa).unwrap().claims;
214 2 : assert_eq!(claims_from_token, expected_claims);
215 2 : }
216 :
217 2 : #[test]
218 2 : fn test_encode() {
219 2 : let claims = Claims {
220 2 : tenant_id: Some(TenantId::from_str("3d1f7595b468230304e0b73cecbcb081").unwrap()),
221 2 : scope: Scope::Tenant,
222 2 : };
223 2 :
224 2 : let encoded = encode_from_key_file(&claims, TEST_PRIV_KEY_ED25519).unwrap();
225 2 :
226 2 : // decode it back
227 2 : let auth = JwtAuth::new(vec![DecodingKey::from_ed_pem(TEST_PUB_KEY_ED25519).unwrap()]);
228 2 : let decoded = auth.decode(&encoded).unwrap();
229 2 :
230 2 : assert_eq!(decoded.claims, claims);
231 2 : }
232 : }
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