Line data Source code
1 : // For details about authentication see docs/authentication.md
2 :
3 : use arc_swap::ArcSwap;
4 : use std::{borrow::Cow, fmt::Display, fs, sync::Arc};
5 :
6 : use anyhow::Result;
7 : use camino::Utf8Path;
8 : use jsonwebtoken::{
9 : decode, encode, Algorithm, DecodingKey, EncodingKey, Header, TokenData, Validation,
10 : };
11 : use serde::{Deserialize, Serialize};
12 :
13 : use crate::{http::error::ApiError, id::TenantId};
14 :
15 : /// Algorithm to use. We require EdDSA.
16 : const STORAGE_TOKEN_ALGORITHM: Algorithm = Algorithm::EdDSA;
17 :
18 4 : #[derive(Debug, Serialize, Deserialize, Clone, Copy, PartialEq)]
19 : #[serde(rename_all = "lowercase")]
20 : pub enum Scope {
21 : /// Provides access to all data for a specific tenant (specified in `struct Claims` below)
22 : // TODO: join these two?
23 : Tenant,
24 : /// Provides blanket access to all tenants on the pageserver plus pageserver-wide APIs.
25 : /// Should only be used e.g. for status check/tenant creation/list.
26 : PageServerApi,
27 : /// Provides blanket access to all data on the safekeeper plus safekeeper-wide APIs.
28 : /// Should only be used e.g. for status check.
29 : /// Currently also used for connection from any pageserver to any safekeeper.
30 : SafekeeperData,
31 : /// The scope used by pageservers in upcalls to storage controller and cloud control plane
32 : #[serde(rename = "generations_api")]
33 : GenerationsApi,
34 : /// Allows access to control plane managment API and all storage controller endpoints.
35 : Admin,
36 :
37 : /// Allows access to control plane & storage controller endpoints used in infrastructure automation (e.g. node registration)
38 : Infra,
39 :
40 : /// Allows access to storage controller APIs used by the scrubber, to interrogate the state
41 : /// of a tenant & post scrub results.
42 : Scrubber,
43 : }
44 :
45 : /// JWT payload. See docs/authentication.md for the format
46 8 : #[derive(Debug, Serialize, Deserialize, Clone, PartialEq)]
47 : pub struct Claims {
48 : #[serde(default)]
49 : pub tenant_id: Option<TenantId>,
50 : pub scope: Scope,
51 : }
52 :
53 : impl Claims {
54 0 : pub fn new(tenant_id: Option<TenantId>, scope: Scope) -> Self {
55 0 : Self { tenant_id, scope }
56 0 : }
57 : }
58 :
59 : pub struct SwappableJwtAuth(ArcSwap<JwtAuth>);
60 :
61 : impl SwappableJwtAuth {
62 0 : pub fn new(jwt_auth: JwtAuth) -> Self {
63 0 : SwappableJwtAuth(ArcSwap::new(Arc::new(jwt_auth)))
64 0 : }
65 0 : pub fn swap(&self, jwt_auth: JwtAuth) {
66 0 : self.0.swap(Arc::new(jwt_auth));
67 0 : }
68 0 : pub fn decode(&self, token: &str) -> std::result::Result<TokenData<Claims>, AuthError> {
69 0 : self.0.load().decode(token)
70 0 : }
71 : }
72 :
73 : impl std::fmt::Debug for SwappableJwtAuth {
74 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
75 0 : write!(f, "Swappable({:?})", self.0.load())
76 0 : }
77 : }
78 :
79 : #[derive(Clone, PartialEq, Eq, Hash, Debug)]
80 : pub struct AuthError(pub Cow<'static, str>);
81 :
82 : impl Display for AuthError {
83 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
84 0 : write!(f, "{}", self.0)
85 0 : }
86 : }
87 :
88 : impl From<AuthError> for ApiError {
89 0 : fn from(_value: AuthError) -> Self {
90 0 : // Don't pass on the value of the AuthError as a precautionary measure.
91 0 : // Being intentionally vague in public error communication hurts debugability
92 0 : // but it is more secure.
93 0 : ApiError::Forbidden("JWT authentication error".to_string())
94 0 : }
95 : }
96 :
97 : pub struct JwtAuth {
98 : decoding_keys: Vec<DecodingKey>,
99 : validation: Validation,
100 : }
101 :
102 : impl JwtAuth {
103 2 : pub fn new(decoding_keys: Vec<DecodingKey>) -> Self {
104 2 : let mut validation = Validation::default();
105 2 : validation.algorithms = vec![STORAGE_TOKEN_ALGORITHM];
106 2 : // The default 'required_spec_claims' is 'exp'. But we don't want to require
107 2 : // expiration.
108 2 : validation.required_spec_claims = [].into();
109 2 : Self {
110 2 : decoding_keys,
111 2 : validation,
112 2 : }
113 2 : }
114 :
115 0 : pub fn from_key_path(key_path: &Utf8Path) -> Result<Self> {
116 0 : let metadata = key_path.metadata()?;
117 0 : let decoding_keys = if metadata.is_dir() {
118 0 : let mut keys = Vec::new();
119 0 : for entry in fs::read_dir(key_path)? {
120 0 : let path = entry?.path();
121 0 : if !path.is_file() {
122 : // Ignore directories (don't recurse)
123 0 : continue;
124 0 : }
125 0 : let public_key = fs::read(path)?;
126 0 : keys.push(DecodingKey::from_ed_pem(&public_key)?);
127 : }
128 0 : keys
129 0 : } else if metadata.is_file() {
130 0 : let public_key = fs::read(key_path)?;
131 0 : vec![DecodingKey::from_ed_pem(&public_key)?]
132 : } else {
133 0 : anyhow::bail!("path is neither a directory or a file")
134 : };
135 0 : if decoding_keys.is_empty() {
136 0 : anyhow::bail!("Configured for JWT auth with zero decoding keys. All JWT gated requests would be rejected.");
137 0 : }
138 0 : Ok(Self::new(decoding_keys))
139 0 : }
140 :
141 0 : pub fn from_key(key: String) -> Result<Self> {
142 0 : Ok(Self::new(vec![DecodingKey::from_ed_pem(key.as_bytes())?]))
143 0 : }
144 :
145 : /// Attempt to decode the token with the internal decoding keys.
146 : ///
147 : /// The function tries the stored decoding keys in succession,
148 : /// and returns the first yielding a successful result.
149 : /// If there is no working decoding key, it returns the last error.
150 2 : pub fn decode(&self, token: &str) -> std::result::Result<TokenData<Claims>, AuthError> {
151 2 : let mut res = None;
152 2 : for decoding_key in &self.decoding_keys {
153 2 : res = Some(decode(token, decoding_key, &self.validation));
154 2 : if let Some(Ok(res)) = res {
155 2 : return Ok(res);
156 0 : }
157 : }
158 0 : if let Some(res) = res {
159 0 : res.map_err(|e| AuthError(Cow::Owned(e.to_string())))
160 : } else {
161 0 : Err(AuthError(Cow::Borrowed("no JWT decoding keys configured")))
162 : }
163 2 : }
164 : }
165 :
166 : impl std::fmt::Debug for JwtAuth {
167 0 : fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
168 0 : f.debug_struct("JwtAuth")
169 0 : .field("validation", &self.validation)
170 0 : .finish()
171 0 : }
172 : }
173 :
174 : // this function is used only for testing purposes in CLI e g generate tokens during init
175 1 : pub fn encode_from_key_file(claims: &Claims, key_data: &[u8]) -> Result<String> {
176 1 : let key = EncodingKey::from_ed_pem(key_data)?;
177 1 : Ok(encode(&Header::new(STORAGE_TOKEN_ALGORITHM), claims, &key)?)
178 1 : }
179 :
180 : #[cfg(test)]
181 : mod tests {
182 : use super::*;
183 : use std::str::FromStr;
184 :
185 : // Generated with:
186 : //
187 : // openssl genpkey -algorithm ed25519 -out ed25519-priv.pem
188 : // openssl pkey -in ed25519-priv.pem -pubout -out ed25519-pub.pem
189 : const TEST_PUB_KEY_ED25519: &[u8] = br#"
190 : -----BEGIN PUBLIC KEY-----
191 : MCowBQYDK2VwAyEARYwaNBayR+eGI0iXB4s3QxE3Nl2g1iWbr6KtLWeVD/w=
192 : -----END PUBLIC KEY-----
193 : "#;
194 :
195 : const TEST_PRIV_KEY_ED25519: &[u8] = br#"
196 : -----BEGIN PRIVATE KEY-----
197 : MC4CAQAwBQYDK2VwBCIEID/Drmc1AA6U/znNRWpF3zEGegOATQxfkdWxitcOMsIH
198 : -----END PRIVATE KEY-----
199 : "#;
200 :
201 : #[test]
202 1 : fn test_decode() {
203 1 : let expected_claims = Claims {
204 1 : tenant_id: Some(TenantId::from_str("3d1f7595b468230304e0b73cecbcb081").unwrap()),
205 1 : scope: Scope::Tenant,
206 1 : };
207 1 :
208 1 : // A test token containing the following payload, signed using TEST_PRIV_KEY_ED25519:
209 1 : //
210 1 : // ```
211 1 : // {
212 1 : // "scope": "tenant",
213 1 : // "tenant_id": "3d1f7595b468230304e0b73cecbcb081",
214 1 : // "iss": "neon.controlplane",
215 1 : // "iat": 1678442479
216 1 : // }
217 1 : // ```
218 1 : //
219 1 : let encoded_eddsa = "eyJhbGciOiJFZERTQSIsInR5cCI6IkpXVCJ9.eyJzY29wZSI6InRlbmFudCIsInRlbmFudF9pZCI6IjNkMWY3NTk1YjQ2ODIzMDMwNGUwYjczY2VjYmNiMDgxIiwiaXNzIjoibmVvbi5jb250cm9scGxhbmUiLCJpYXQiOjE2Nzg0NDI0Nzl9.rNheBnluMJNgXzSTTJoTNIGy4P_qe0JUHl_nVEGuDCTgHOThPVr552EnmKccrCKquPeW3c2YUk0Y9Oh4KyASAw";
220 1 :
221 1 : // Check it can be validated with the public key
222 1 : let auth = JwtAuth::new(vec![DecodingKey::from_ed_pem(TEST_PUB_KEY_ED25519).unwrap()]);
223 1 : let claims_from_token = auth.decode(encoded_eddsa).unwrap().claims;
224 1 : assert_eq!(claims_from_token, expected_claims);
225 1 : }
226 :
227 : #[test]
228 1 : fn test_encode() {
229 1 : let claims = Claims {
230 1 : tenant_id: Some(TenantId::from_str("3d1f7595b468230304e0b73cecbcb081").unwrap()),
231 1 : scope: Scope::Tenant,
232 1 : };
233 1 :
234 1 : let encoded = encode_from_key_file(&claims, TEST_PRIV_KEY_ED25519).unwrap();
235 1 :
236 1 : // decode it back
237 1 : let auth = JwtAuth::new(vec![DecodingKey::from_ed_pem(TEST_PUB_KEY_ED25519).unwrap()]);
238 1 : let decoded = auth.decode(&encoded).unwrap();
239 1 :
240 1 : assert_eq!(decoded.claims, claims);
241 1 : }
242 : }
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