kopi 0.0.9

Kopi is a JDK version management tool
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
254
255
256
257
258
259
260
261
262

// Copyright 2025 dentsusoken
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use crate::error::KopiError;
use std::fs;
use std::path::{Path, PathBuf};

use super::tools::ToolRegistry;
use crate::config::KopiConfig;

pub struct SecurityValidator {
    kopi_home: PathBuf,
    tool_registry: ToolRegistry,
}

impl SecurityValidator {
    pub fn new(config: &KopiConfig) -> Self {
        Self {
            kopi_home: config.kopi_home().to_path_buf(),
            tool_registry: ToolRegistry::new(),
        }
    }

    pub fn validate_path(&self, path: &Path) -> Result<(), KopiError> {
        let canonical_path = path.canonicalize().map_err(|e| {
            KopiError::SystemError(format!(
                "Failed to canonicalize path '{}': {}",
                path.display(),
                e
            ))
        })?;

        let canonical_kopi_home = self.kopi_home.canonicalize().map_err(|e| {
            KopiError::SystemError(format!(
                "Failed to canonicalize KOPI_HOME '{}': {}",
                self.kopi_home.display(),
                e
            ))
        })?;

        if !canonical_path.starts_with(&canonical_kopi_home) {
            return Err(KopiError::SecurityError(format!(
                "Path '{}' is outside KOPI_HOME directory",
                path.display()
            )));
        }

        if path.components().any(|c| c.as_os_str() == "..") {
            return Err(KopiError::SecurityError(
                "Path contains directory traversal components (..)".to_string(),
            ));
        }

        Ok(())
    }

    pub fn validate_version(&self, version: &str) -> Result<(), KopiError> {
        if version.is_empty() {
            return Err(KopiError::ValidationError(
                "Version string cannot be empty".to_string(),
            ));
        }

        if version.len() > 100 {
            return Err(KopiError::ValidationError(
                "Version string is too long (max 100 characters)".to_string(),
            ));
        }

        let valid_chars = |c: char| c.is_alphanumeric() || matches!(c, '@' | '.' | '-' | '_' | '+');

        if !version.chars().all(valid_chars) {
            return Err(KopiError::ValidationError(format!(
                "Version '{version}' contains invalid characters. Only alphanumeric and @.-_+ are \
                 allowed"
            )));
        }

        if version.contains("..") || version.contains("//") {
            return Err(KopiError::SecurityError(
                "Version string contains suspicious patterns".to_string(),
            ));
        }

        Ok(())
    }

    pub fn validate_tool(&self, tool: &str) -> Result<(), KopiError> {
        if self.tool_registry.get_tool(tool).is_none() {
            return Err(KopiError::ValidationError(format!(
                "'{tool}' is not a recognized JDK tool"
            )));
        }
        Ok(())
    }

    pub fn check_permissions(&self, path: &Path) -> Result<(), KopiError> {
        crate::platform::file_ops::check_executable_permissions(path)
    }

    pub fn validate_symlink(&self, symlink_path: &Path) -> Result<(), KopiError> {
        if !symlink_path.is_symlink() {
            return Ok(());
        }

        let target = fs::read_link(symlink_path).map_err(|e| {
            KopiError::SystemError(format!(
                "Failed to read symlink target for '{}': {}",
                symlink_path.display(),
                e
            ))
        })?;

        let absolute_target = if target.is_relative() {
            symlink_path
                .parent()
                .ok_or_else(|| {
                    KopiError::SystemError(format!(
                        "Symlink '{}' has no parent directory",
                        symlink_path.display()
                    ))
                })?
                .join(&target)
        } else {
            target
        };

        self.validate_path(&absolute_target)?;

        Ok(())
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    #[cfg(unix)]
    use std::fs::File;
    #[cfg(unix)]
    use std::os::unix::fs::symlink;
    use tempfile::TempDir;

    fn create_test_validator() -> (SecurityValidator, TempDir) {
        let temp_dir = TempDir::new().unwrap();
        // Create necessary directories for config
        std::fs::create_dir_all(temp_dir.path()).unwrap();
        let config = crate::config::KopiConfig::new(temp_dir.path().to_path_buf()).unwrap();
        let validator = SecurityValidator::new(&config);
        (validator, temp_dir)
    }

    #[test]
    fn test_validate_path_within_kopi_home() {
        let (validator, temp_dir) = create_test_validator();
        let valid_path = temp_dir.path().join("jdks").join("java-11");
        std::fs::create_dir_all(&valid_path).unwrap();

        assert!(validator.validate_path(&valid_path).is_ok());
    }

    #[test]
    fn test_validate_path_outside_kopi_home() {
        let (validator, _temp_dir) = create_test_validator();
        let invalid_path = Path::new("/etc/passwd");

        let result = validator.validate_path(invalid_path);
        assert!(result.is_err());
        assert!(matches!(
            result,
            Err(KopiError::SecurityError(_)) | Err(KopiError::SystemError(_))
        ));
    }

    #[test]
    fn test_validate_version_valid() {
        let (validator, _) = create_test_validator();

        assert!(validator.validate_version("21").is_ok());
        assert!(validator.validate_version("temurin@21.0.1").is_ok());
        assert!(validator.validate_version("graalvm-ce@22.3.0").is_ok());
        assert!(validator.validate_version("11.0.2_9").is_ok());
        assert!(validator.validate_version("17+35").is_ok());
    }

    #[test]
    fn test_validate_version_invalid() {
        let (validator, _) = create_test_validator();

        assert!(validator.validate_version("").is_err());
        assert!(validator.validate_version("../../../etc/passwd").is_err());
        assert!(validator.validate_version("java; rm -rf /").is_err());
        assert!(validator.validate_version("java\necho hacked").is_err());
        assert!(validator.validate_version(&"x".repeat(101)).is_err());
    }

    #[test]
    fn test_validate_tool_valid() {
        let (validator, _) = create_test_validator();

        assert!(validator.validate_tool("java").is_ok());
        assert!(validator.validate_tool("javac").is_ok());
        assert!(validator.validate_tool("native-image").is_ok());
    }

    #[test]
    fn test_validate_tool_invalid() {
        let (validator, _) = create_test_validator();

        assert!(validator.validate_tool("unknown-tool").is_err());
        assert!(validator.validate_tool("rm").is_err());
    }

    #[test]
    #[cfg(unix)]
    fn test_check_permissions_unix() {
        use std::fs::Permissions;
        use std::os::unix::fs::PermissionsExt;

        let (validator, temp_dir) = create_test_validator();
        let exec_file = temp_dir.path().join("executable");
        File::create(&exec_file).unwrap();

        fs::set_permissions(&exec_file, Permissions::from_mode(0o755)).unwrap();
        assert!(validator.check_permissions(&exec_file).is_ok());

        fs::set_permissions(&exec_file, Permissions::from_mode(0o644)).unwrap();
        assert!(validator.check_permissions(&exec_file).is_err());

        fs::set_permissions(&exec_file, Permissions::from_mode(0o777)).unwrap();
        let result = validator.check_permissions(&exec_file);
        assert!(result.is_err());
        assert!(result.unwrap_err().to_string().contains("world-writable"));
    }

    #[test]
    #[cfg(unix)]
    fn test_validate_symlink() {
        let (validator, temp_dir) = create_test_validator();
        let target = temp_dir.path().join("target");
        let link = temp_dir.path().join("link");

        File::create(&target).unwrap();
        symlink(&target, &link).unwrap();

        assert!(validator.validate_symlink(&link).is_ok());

        let bad_link = temp_dir.path().join("bad_link");
        symlink("/etc/passwd", &bad_link).unwrap();
        assert!(validator.validate_symlink(&bad_link).is_err());
    }
}