fnox 1.23.0

A flexible secret management tool supporting multiple providers and encryption methods
Documentation 
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

use crate::error::{FnoxError, Result};
use async_trait::async_trait;
use azure_identity::DeveloperToolsCredential;
use azure_security_keyvault_keys::{
    KeyClient,
    models::{EncryptionAlgorithm, KeyOperationParameters},
};

pub fn env_dependencies() -> &'static [&'static str] {
    &[]
}

const URL: &str = "https://fnox.jdx.dev/providers/azure-kms";

pub struct AzureKeyVaultProvider {
    vault_url: String,
    key_name: String,
}

impl AzureKeyVaultProvider {
    pub fn new(vault_url: String, key_name: String) -> Result<Self> {
        Ok(Self {
            vault_url,
            key_name,
        })
    }

    /// Create an Azure Key Vault key client
    fn create_client(&self) -> Result<KeyClient> {
        // Use DeveloperToolsCredential which supports multiple auth methods:
        // - Azure CLI
        // - Azure Developer CLI
        let credential =
            DeveloperToolsCredential::new(None).map_err(|e| FnoxError::ProviderAuthFailed {
                provider: "Azure Key Vault".to_string(),
                details: e.to_string(),
                hint: "Run 'az login' to authenticate with Azure".to_string(),
                url: URL.to_string(),
            })?;

        KeyClient::new(&self.vault_url, credential, None).map_err(|e| FnoxError::ProviderApiError {
            provider: "Azure Key Vault".to_string(),
            details: e.to_string(),
            hint: "Check your Azure Key Vault URL".to_string(),
            url: URL.to_string(),
        })
    }

    /// Decrypt a ciphertext value using Azure Key Vault
    async fn decrypt(&self, ciphertext_base64: &str) -> Result<String> {
        let client = self.create_client()?;

        // Decode from base64
        let ciphertext_bytes = base64::Engine::decode(
            &base64::engine::general_purpose::STANDARD,
            ciphertext_base64,
        )
        .map_err(|e| FnoxError::ProviderInvalidResponse {
            provider: "Azure Key Vault".to_string(),
            details: format!("Failed to decode base64 ciphertext: {}", e),
            hint: "The encrypted value appears to be corrupted".to_string(),
            url: URL.to_string(),
        })?;

        // Create decrypt parameters with RSA-OAEP-256 algorithm
        let params = KeyOperationParameters {
            algorithm: Some(EncryptionAlgorithm::RsaOaep256),
            value: Some(ciphertext_bytes),
            ..Default::default()
        };

        // Decrypt using Azure Key Vault
        let response = client
            .decrypt(
                &self.key_name,
                params
                    .try_into()
                    .map_err(|e| FnoxError::ProviderInvalidResponse {
                        provider: "Azure Key Vault".to_string(),
                        details: format!("Failed to create decrypt parameters: {}", e),
                        hint: "This is an unexpected error".to_string(),
                        url: URL.to_string(),
                    })?,
                None,
            )
            .await
            .map_err(|e| {
                let err_str = e.to_string();
                if err_str.contains("KeyNotFound") || err_str.contains("not found") {
                    FnoxError::ProviderSecretNotFound {
                        provider: "Azure Key Vault".to_string(),
                        secret: self.key_name.clone(),
                        hint: "Check that the key exists in the vault".to_string(),
                        url: URL.to_string(),
                    }
                } else if err_str.contains("Forbidden") || err_str.contains("Unauthorized") {
                    FnoxError::ProviderAuthFailed {
                        provider: "Azure Key Vault".to_string(),
                        details: err_str,
                        hint: "Check your Azure Key Vault access policies".to_string(),
                        url: URL.to_string(),
                    }
                } else {
                    FnoxError::ProviderApiError {
                        provider: "Azure Key Vault".to_string(),
                        details: err_str,
                        hint: "Check your Azure Key Vault configuration".to_string(),
                        url: URL.to_string(),
                    }
                }
            })?;

        let result = response
            .into_model()
            .map_err(|e| FnoxError::ProviderInvalidResponse {
                provider: "Azure Key Vault".to_string(),
                details: format!("Failed to parse decrypt response: {}", e),
                hint: "This is an unexpected error".to_string(),
                url: URL.to_string(),
            })?;

        let plaintext_bytes = result
            .result
            .ok_or_else(|| FnoxError::ProviderInvalidResponse {
                provider: "Azure Key Vault".to_string(),
                details: "Decrypt result has no value".to_string(),
                hint: "The decryption returned no plaintext".to_string(),
                url: URL.to_string(),
            })?;

        // Convert bytes to string
        String::from_utf8(plaintext_bytes).map_err(|e| FnoxError::ProviderInvalidResponse {
            provider: "Azure Key Vault".to_string(),
            details: format!("Decrypted value is not valid UTF-8: {}", e),
            hint: "The decrypted value contains invalid UTF-8 characters".to_string(),
            url: URL.to_string(),
        })
    }
}

#[async_trait]
impl crate::providers::Provider for AzureKeyVaultProvider {
    fn capabilities(&self) -> Vec<crate::providers::ProviderCapability> {
        vec![crate::providers::ProviderCapability::Encryption]
    }

    async fn get_secret(&self, value: &str) -> Result<String> {
        // value contains the base64-encoded encrypted blob
        self.decrypt(value).await
    }

    async fn encrypt(&self, plaintext: &str) -> Result<String> {
        let client = self.create_client()?;

        // Create encrypt parameters with RSA-OAEP-256 algorithm
        let params = KeyOperationParameters {
            algorithm: Some(EncryptionAlgorithm::RsaOaep256),
            value: Some(plaintext.as_bytes().to_vec()),
            ..Default::default()
        };

        // Encrypt using Azure Key Vault
        let response = client
            .encrypt(
                &self.key_name,
                params
                    .try_into()
                    .map_err(|e| FnoxError::ProviderInvalidResponse {
                        provider: "Azure Key Vault".to_string(),
                        details: format!("Failed to create encrypt parameters: {}", e),
                        hint: "This is an unexpected error".to_string(),
                        url: URL.to_string(),
                    })?,
                None,
            )
            .await
            .map_err(|e| {
                let err_str = e.to_string();
                if err_str.contains("Forbidden") || err_str.contains("Unauthorized") {
                    FnoxError::ProviderAuthFailed {
                        provider: "Azure Key Vault".to_string(),
                        details: err_str,
                        hint: "Check your Azure Key Vault access policies".to_string(),
                        url: URL.to_string(),
                    }
                } else {
                    FnoxError::ProviderApiError {
                        provider: "Azure Key Vault".to_string(),
                        details: err_str,
                        hint: "Check your Azure Key Vault configuration".to_string(),
                        url: URL.to_string(),
                    }
                }
            })?;

        let result = response
            .into_model()
            .map_err(|e| FnoxError::ProviderInvalidResponse {
                provider: "Azure Key Vault".to_string(),
                details: format!("Failed to parse encrypt response: {}", e),
                hint: "This is an unexpected error".to_string(),
                url: URL.to_string(),
            })?;

        let ciphertext_bytes = result
            .result
            .ok_or_else(|| FnoxError::ProviderInvalidResponse {
                provider: "Azure Key Vault".to_string(),
                details: "Encrypt result has no value".to_string(),
                hint: "The encryption returned no ciphertext".to_string(),
                url: URL.to_string(),
            })?;

        // Encode as base64 for storage
        Ok(base64::Engine::encode(
            &base64::engine::general_purpose::STANDARD,
            &ciphertext_bytes,
        ))
    }

    async fn test_connection(&self) -> Result<()> {
        let client = self.create_client()?;

        // Try to get the key to verify access
        client.get_key(&self.key_name, None).await.map_err(|e| {
            let err_str = e.to_string();
            if err_str.contains("KeyNotFound") || err_str.contains("not found") {
                FnoxError::ProviderSecretNotFound {
                    provider: "Azure Key Vault".to_string(),
                    secret: self.key_name.clone(),
                    hint: "Check that the key exists in the vault".to_string(),
                    url: URL.to_string(),
                }
            } else if err_str.contains("Forbidden") || err_str.contains("Unauthorized") {
                FnoxError::ProviderAuthFailed {
                    provider: "Azure Key Vault".to_string(),
                    details: err_str,
                    hint: "Check your Azure Key Vault access policies".to_string(),
                    url: URL.to_string(),
                }
            } else {
                FnoxError::ProviderApiError {
                    provider: "Azure Key Vault".to_string(),
                    details: format!("Failed to access key '{}': {}", self.key_name, err_str),
                    hint: "Check your Azure Key Vault configuration".to_string(),
                    url: URL.to_string(),
                }
            }
        })?;

        Ok(())
    }
}