denki 0.1.2

CLI for controlling TP-Link smart home devices — denki (電気) means electricity in Japanese
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

//! Independent local HTTP peer exercises the actual handshake, AES framing, and ops.
use super::*;
use serde_json::{Value, json};
use tokio::net::TcpListener;

async fn peer(replies: Vec<Value>) -> (u16, tokio::task::JoinHandle<Vec<Value>>) {
    peer_with_corruption(replies, false).await
}
async fn peer_with_corruption(
    replies: Vec<Value>,
    corrupt: bool,
) -> (u16, tokio::task::JoinHandle<Vec<Value>>) {
    let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
    let port = listener.local_addr().unwrap().port();
    let task = tokio::spawn(async move {
        let remote_seed = [0x35; 16];
        let auth = auth_hash("test@example.invalid", "test-password");
        let mut local_seed = Vec::new();
        let mut requests = Vec::new();
        // Two handshakes, followed by a sequence of actual encrypted operations.
        for step in 0..(2 + replies.len()) {
            let (mut socket, _) = listener.accept().await.unwrap();
            let headers = String::from_utf8(read_headers(&mut socket).await.unwrap()).unwrap();
            let length = response_content_length(&headers).unwrap();
            let mut body = vec![0; length];
            socket.read_exact(&mut body).await.unwrap();
            let mut response = match step {
                0 => {
                    assert!(headers.starts_with("POST /app/handshake1 "));
                    assert_eq!(body.len(), 16);
                    local_seed = body;
                    let proof = sha256_multi(&[&local_seed, &remote_seed, &auth]);
                    [remote_seed.as_slice(), &proof].concat()
                }
                1 => {
                    assert!(headers.starts_with("POST /app/handshake2 "));
                    assert_eq!(body, sha256_multi(&[&remote_seed, &local_seed, &auth]));
                    assert!(headers.contains("Cookie: TP_SESSIONID=test-session"));
                    Vec::new()
                }
                _ => {
                    let path = headers.split_whitespace().nth(1).unwrap();
                    let seq: i32 = path.split("seq=").nth(1).unwrap().parse().unwrap();
                    let key: [u8; 16] = sha256_multi(&[b"lsk", &local_seed, &remote_seed, &auth])
                        [..16]
                        .try_into()
                        .unwrap();
                    let full_iv = sha256_multi(&[b"iv", &local_seed, &remote_seed, &auth]);
                    assert_eq!(
                        seq,
                        i32::from_be_bytes(full_iv[28..32].try_into().unwrap())
                            .wrapping_add((step - 1) as i32)
                    );
                    let mut iv = [0u8; 16];
                    iv[..12].copy_from_slice(&full_iv[..12]);
                    iv[12..].copy_from_slice(&seq.to_be_bytes());
                    let signing = sha256_multi(&[b"ldk", &local_seed, &remote_seed, &auth]);
                    let tag = sha256_multi(&[&signing[..28], &seq.to_be_bytes(), &body[32..]]);
                    assert_eq!(&body[..32], tag.as_slice());
                    let plain = Aes128CbcDec::new(&key.into(), &iv.into())
                        .decrypt_padded_vec::<Pkcs7>(&body[32..])
                        .unwrap();
                    let request: Value = serde_json::from_slice(&plain).unwrap();
                    assert!(request["method"].is_string());
                    requests.push(request);
                    let ciphertext = Aes128CbcEnc::new(&key.into(), &iv.into())
                        .encrypt_padded_vec::<Pkcs7>(
                            &serde_json::to_vec(&replies[step - 2]).unwrap(),
                        );
                    let tag = sha256_multi(&[&signing[..28], &seq.to_be_bytes(), &ciphertext]);
                    [tag.as_slice(), &ciphertext].concat()
                }
            };
            if corrupt && step >= 2 {
                response[0] ^= 1;
            }
            let header = format!(
                "HTTP/1.1 200 OK\r\nContent-Length: {}\r\nSet-Cookie: TP_SESSIONID=test-session; Path=/\r\n\r\n",
                response.len()
            );
            socket.write_all(header.as_bytes()).await.unwrap();
            socket.write_all(&response).await.unwrap();
        }
        // Watch for forbidden mutation requests after an invalid state response.
        if let Ok(Ok((mut socket, _))) =
            tokio::time::timeout(Duration::from_millis(150), listener.accept()).await
        {
            let headers = read_headers(&mut socket).await.unwrap();
            requests.push(json!({"unexpected_request":String::from_utf8_lossy(&headers)}));
        }
        requests
    });
    (port, task)
}
#[tokio::test]
async fn malformed_tapo_state_and_envelopes_never_send_mutations() {
    for response in [
        json!({}),
        json!({"error_code":"0"}),
        json!({"error_code":-1501}),
        json!({"error_code":0,"result":{"device_on":null}}),
        json!({"error_code":0,"result":{"device_on":"false"}}),
    ] {
        let (port, peer) = peer(vec![response]).await;
        let mut session = handshake_at("127.0.0.1", port, "test@example.invalid", "test-password")
            .await
            .unwrap();
        let error = crate::ops::tapo_toggle(&mut session).await.unwrap_err();
        assert!(matches!(
            crate::error::code(&error),
            "malformed_response" | "device_rejected"
        ));
        assert_eq!(
            peer.await.unwrap().len(),
            1,
            "must not send a mutation after invalid device info"
        );
    }
}
#[tokio::test]
async fn valid_tapo_device_info_round_trips_over_http_and_aes() {
    let response = json!({"error_code":0,"result":{"model":"P125","hw_ver":"1.0","fw_ver":"1.0","rssi":-40,"device_on":false,"device_id":"synthetic-tapo","nickname":"VGVzdA=="}});
    let (port, peer) = peer(vec![response.clone()]).await;
    let mut session = handshake_at("127.0.0.1", port, "test@example.invalid", "test-password")
        .await
        .unwrap();
    assert_eq!(
        crate::ops::tapo_device_info(&mut session).await.unwrap(),
        response
    );
    assert_eq!(peer.await.unwrap().len(), 1);
}

#[tokio::test]
async fn tapo_mutation_acknowledgments_are_strict_and_session_sequences_advance() {
    let info = json!({"error_code":0,"result":{"model":"P125","hw_ver":"1.0","fw_ver":"1.0","rssi":-40,"device_on":false,"device_id":"synthetic-tapo"}});
    for (ack, expected) in [
        (json!({}), Some("malformed_response")),
        (json!({"error_code":"0"}), Some("malformed_response")),
        (json!({"error_code":-1}), Some("device_rejected")),
        (json!({"error_code":0}), None),
    ] {
        let (port, peer) = peer(vec![info.clone(), info.clone(), ack]).await;
        let mut session = handshake_at("127.0.0.1", port, "test@example.invalid", "test-password")
            .await
            .unwrap();
        let result = crate::ops::tapo_toggle(&mut session).await;
        match expected {
            Some(code) => assert_eq!(crate::error::code(&result.unwrap_err()), code),
            None => assert!(result.unwrap()),
        }
        let requests = peer.await.unwrap();
        assert_eq!(requests.len(), 3);
        assert_eq!(
            requests[2],
            json!({"method":"set_device_info","params":{"device_on":true}})
        );
    }
}
#[tokio::test]
async fn repeated_energy_reads_reuse_the_authenticated_session() {
    let response = json!({"error_code":0,"result":{"current_power":2300,"today_energy":45,"month_energy":500}});
    let (port, peer) = peer(vec![response.clone(), response.clone()]).await;
    let mut session = handshake_at("127.0.0.1", port, "test@example.invalid", "test-password")
        .await
        .unwrap();
    for _ in 0..2 {
        assert_eq!(
            crate::ops::tapo_energy_usage(&mut session).await.unwrap(),
            response
        );
    }
    let requests = peer.await.unwrap();
    assert_eq!(requests.len(), 2);
    assert!(requests.iter().all(|r| r["method"] == "get_energy_usage"));
}

#[tokio::test]
async fn tampered_http_response_never_triggers_a_power_mutation() {
    let info = json!({"error_code":0,"result":{"model":"P125","hw_ver":"1.0","fw_ver":"1.0","rssi":-40,"device_on":false,"device_id":"synthetic-tapo"}});
    let (port, peer) = peer_with_corruption(vec![info], true).await;
    let mut session = handshake_at("127.0.0.1", port, "test@example.invalid", "test-password")
        .await
        .unwrap();
    let error = crate::ops::tapo_toggle(&mut session).await.unwrap_err();
    assert_eq!(crate::error::code(&error), "integrity_failed");
    assert_eq!(peer.await.unwrap().len(), 1);
}