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

// Copyright 2023 Greptime Team
//
// 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.

pub(crate) mod static_user_provider;
pub(crate) mod watch_file_user_provider;

use std::collections::HashMap;
use std::fs::File;
use std::io;
use std::io::BufRead;
use std::path::Path;

use common_base::secrets::ExposeSecret;
use snafu::{ensure, OptionExt, ResultExt};

use crate::common::{Identity, Password};
use crate::error::{
    IllegalParamSnafu, InvalidConfigSnafu, IoSnafu, Result, UnsupportedPasswordTypeSnafu,
    UserNotFoundSnafu, UserPasswordMismatchSnafu,
};
use crate::user_info::DefaultUserInfo;
use crate::{auth_mysql, UserInfoRef};

#[async_trait::async_trait]
pub trait UserProvider: Send + Sync {
    fn name(&self) -> &str;

    /// Checks whether a user is valid and allowed to access the database.
    async fn authenticate(&self, id: Identity<'_>, password: Password<'_>) -> Result<UserInfoRef>;

    /// Checks whether a connection request
    /// from a certain user to a certain catalog/schema is legal.
    /// This method should be called after [authenticate()](UserProvider::authenticate()).
    async fn authorize(&self, catalog: &str, schema: &str, user_info: &UserInfoRef) -> Result<()>;

    /// Combination of [authenticate()](UserProvider::authenticate()) and [authorize()](UserProvider::authorize()).
    /// In most cases it's preferred for both convenience and performance.
    async fn auth(
        &self,
        id: Identity<'_>,
        password: Password<'_>,
        catalog: &str,
        schema: &str,
    ) -> Result<UserInfoRef> {
        let user_info = self.authenticate(id, password).await?;
        self.authorize(catalog, schema, &user_info).await?;
        Ok(user_info)
    }
}

fn load_credential_from_file(filepath: &str) -> Result<Option<HashMap<String, Vec<u8>>>> {
    // check valid path
    let path = Path::new(filepath);
    if !path.exists() {
        return Ok(None);
    }

    ensure!(
        path.is_file(),
        InvalidConfigSnafu {
            value: filepath,
            msg: "UserProvider file must be a file",
        }
    );
    let file = File::open(path).context(IoSnafu)?;
    let credential = io::BufReader::new(file)
        .lines()
        .map_while(std::result::Result::ok)
        .filter_map(|line| {
            if let Some((k, v)) = line.split_once('=') {
                Some((k.to_string(), v.as_bytes().to_vec()))
            } else {
                None
            }
        })
        .collect::<HashMap<String, Vec<u8>>>();

    ensure!(
        !credential.is_empty(),
        InvalidConfigSnafu {
            value: filepath,
            msg: "UserProvider's file must contains at least one valid credential",
        }
    );

    Ok(Some(credential))
}

fn authenticate_with_credential(
    users: &HashMap<String, Vec<u8>>,
    input_id: Identity<'_>,
    input_pwd: Password<'_>,
) -> Result<UserInfoRef> {
    match input_id {
        Identity::UserId(username, _) => {
            ensure!(
                !username.is_empty(),
                IllegalParamSnafu {
                    msg: "blank username"
                }
            );
            let save_pwd = users.get(username).context(UserNotFoundSnafu {
                username: username.to_string(),
            })?;

            match input_pwd {
                Password::PlainText(pwd) => {
                    ensure!(
                        !pwd.expose_secret().is_empty(),
                        IllegalParamSnafu {
                            msg: "blank password"
                        }
                    );
                    if save_pwd == pwd.expose_secret().as_bytes() {
                        Ok(DefaultUserInfo::with_name(username))
                    } else {
                        UserPasswordMismatchSnafu {
                            username: username.to_string(),
                        }
                        .fail()
                    }
                }
                Password::MysqlNativePassword(auth_data, salt) => {
                    auth_mysql(auth_data, salt, username, save_pwd)
                        .map(|_| DefaultUserInfo::with_name(username))
                }
                Password::PgMD5(_, _) => UnsupportedPasswordTypeSnafu {
                    password_type: "pg_md5",
                }
                .fail(),
            }
        }
    }
}