connect.rs 74.8%

98 of 131 lines run, 11 of 44 functions · run #32 on main · run missed

//! `spectra connect` and the client configuration (spec §8.6): trust a
//! Spectra on another machine because the owner's own identity delegates
//! to its instance key and that key vouches for its certificate; pin the
//! certificate; claim a server set up with `spectra init --owner`.

use super::{identity, ui, Ctx};
use anyhow::{bail, Context, Result};
use serde_json::Value as Json;
use spectra_core::daemon::WireEvent;
use spectra_core::identity::Identity;
use spectra_core::keys::KeyPair;
use spectra_core::principals::{identity_payload, signed_event};
use spectra_mcp::client::{host_port, Client, Endpoint};
use spectra_mcp::tls::Pinned;
use std::path::{Path, PathBuf};

/// The client configuration: which server, and what to trust there.
#[derive(Clone, Debug)]
pub struct ClientCfg {
    pub server: String,
    pub instance: String,
    pub tls_spki: [u8; 32],
}

impl ClientCfg {
    pub fn endpoint(&self) -> Result<Endpoint> {
        Endpoint::tls(&self.server, self.tls_spki)
    }
}

/// `SPECTRA_SERVER`, else `client.toml` in the owner's identity home.
pub fn path() -> PathBuf {
    if let Some(p) = std::env::var_os("SPECTRA_SERVER").filter(|p| !p.is_empty()) {
        return PathBuf::from(p);
    }
    config_dir().join("client.toml")
}

/// The owner's identity home, where the client configuration lives too.
fn config_dir() -> PathBuf {
    spectra_core::keys::default_home()
}

/// The client configuration, if this machine uses a Spectra elsewhere.
pub fn load() -> Result<Option<ClientCfg>> {
    let p = path();
    let text = match std::fs::read_to_string(&p) {
        Ok(t) => t,
        Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(None),
        Err(e) => return Err(e).with_context(|| format!("reading {}", p.display())),
    };
    let t: toml::Table = text.parse().with_context(|| format!("reading {}", p.display()))?;
    let get = |k: &str| t.get(k).and_then(|v| v.as_str()).map(String::from).with_context(|| format!("{} has no {k}", p.display()));
    let spki = hex::decode(get("tls_spki")?).ok().and_then(|b| b.try_into().ok()).with_context(|| format!("{}: tls_spki", p.display()))?;
    Ok(Some(ClientCfg { server: get("server")?, instance: get("instance")?, tls_spki: spki }))
}

fn save(cfg: &ClientCfg) -> Result<PathBuf> {
    let p = path();
    if let Some(dir) = p.parent() {
        std::fs::create_dir_all(dir)?;
    }
    std::fs::write(
        &p,
        format!(
            "# Spectra on another machine (spec §8.6), written by `spectra connect`.\n\nserver = \"{}\"\ninstance = \"{}\"                    # the instance key, delegated by the owner\ntls_spki = \"{}\"   # the certificate the instance key vouches for\n",
            cfg.server,
            cfg.instance,
            hex::encode(cfg.tls_spki)
        ),
    )?;
    Ok(p)
}

/// The key pair of the identity `key` in the owner's home, if it is theirs.
fn own(home: &Path, key: &str) -> Option<KeyPair> {
    let keys = home.join("keys");
    KeyPair::load(&keys.join(format!("{key}.secret")), &keys.join(format!("{key}.identity"))).ok()
}

pub async fn connect(_ctx: &Ctx, url: &str, owner_home: Option<PathBuf>, expect: Option<String>, yes: bool) -> Result<i32> {
    let server = format!("https://{}", host_port(url)?);
    let home = owner_home.unwrap_or_else(spectra_core::keys::default_home);
    let mut owner = KeyPair::load_home(&home)
        .with_context(|| format!("the owner connects with their own identity: none usable in {} (or --owner-home)", home.display()))?;

    // Who is there, before trusting anything.
    let probe = Pinned::new(None);
    let anon = Client::at(Endpoint::Tls { addr: host_port(url)?, config: probe.client_config()? }, None);
    let r = anon.send("GET", "/api/v1/instance", &[], vec![]).await.with_context(|| format!("reaching {server}"))?;
    if r.status != 200 {
        bail!("{server} answered {} to /api/v1/instance: is it a Spectra?", r.status);
    }
    let answer = r.json()?;
    let (_, seen) = probe.seen().context("the server showed no certificate")?;
    let checked = spectra_mcp::instance::check(&answer, &seen)?;
    let instance_key = checked.instance.hash();

    // Whose it is, or whose it is waiting for.
    let recorded = checked.owner.clone();
    let named = answer.get("named_owner").and_then(Json::as_str).map(String::from);
    match (&recorded, &named) {
        (Some(k), _) if *k != owner.key.to_hex() && own(&home, k).is_none() => {
            bail!("{server} belongs to someone else (owner {})", &k[..12.min(k.len())]);
        }
        (None, Some(k)) if own(&home, k).is_none() => {
            bail!(
                "{server} was set up for {}, which is not an identity in {} (spectra init --owner takes `spectra identity show`'s key)",
                &k[..12.min(k.len())],
                home.display()
            );
        }
        (None, None) => bail!("{server} has no owner and names none"),
        _ => {}
    }

    // Trust: the owner's own identity delegates to that instance key now.
    if !owner.identity.delegates_to(&instance_key, spectra_core::ids::now_ms()) {
        println!("{}", ui::kv("server", ui::path(&server)));
        println!("{}", ui::kv("instance", format!("{}{}{}", checked.name, ui::sep(), ui::hash(instance_key.to_hex()))));
        println!("  {} {}", ui::note(), ui::dim("`spectra init` printed this instance's key on the server: check it is the same"));
        match &expect {
            Some(prefix) if instance_key.to_hex().starts_with(&prefix.trim().to_ascii_lowercase()) => {}
            Some(prefix) => bail!("the server's instance key does not start with {prefix}: not trusted"),
            None => super::agent::confirm(&format!("Trust {} as your Spectra", checked.name), yes)?,
        }
        owner = spectra_core::keys::delegate(&home, instance_key, None)?;
    }

    let cfg = ClientCfg { server: server.clone(), instance: instance_key.to_hex(), tls_spki: seen };
    let saved = save(&cfg)?;
    let pinned = cfg.endpoint()?;

    // Claim it, or bring it up to the owner's current identity.
    let mut claimed = false;
    match (&recorded, &named) {
        (None, Some(k)) => {
            let named_pair = own(&home, k).expect("checked above");
            let mut events =
                vec![WireEvent::from_new(&signed_event(&named_pair, "human", "identity.owner", identity_payload(&named_pair.identity)))];
            if let Some(e) = identity::rotation(&named_pair.identity, &home)? {
                events.push(WireEvent::from_new(&e));
            }
            let r = Client::at(pinned.clone(), None).send("POST", "/api/v1/claim", &[], serde_json::to_vec(&events)?).await?;
            if r.status != 200 {
                bail!("{server} refused the claim: {}", problem(&r.body));
            }
            claimed = true;
        }
        (Some(k), _) if *k != owner.key.to_hex() => {
            let rec_pair = own(&home, k).expect("checked above");
            let rec_id: Identity = rec_pair.identity.clone();
            if let Some(e) = identity::rotation(&rec_id, &home)? {
                let body = serde_json::to_vec(&vec![WireEvent::from_new(&e)])?;
                let r = Client::at(pinned.clone(), Some(rec_pair)).send("POST", "/api/v1/ledger/events", &[], body).await?;
                if r.status != 200 {
                    bail!("{server} refused the owner's current identity: {}", problem(&r.body));
                }
            }
        }
        _ => {}
    }

    println!("{} {}  {}", ui::done(if claimed { "Claimed" } else { "Connected" }), ui::subject(&checked.name), ui::path(&server));
    println!("{}", ui::kv("owner", format!("{}{}{}", ui::author(&owner.identity.name), ui::sep(), ui::hash(owner.key.short(12)))));
    println!("{}", ui::kv("instance", format!("{}{}", ui::hash(instance_key.short(12)), ui::dim(" (delegated by you)"))));
    println!(
        "{}",
        ui::kv("certificate", format!("{}{}", ui::hash(hex::encode(&seen[..8])), ui::dim(" (pinned; vouched for by the instance key)")))
    );
    println!("{}", ui::kv("config", ui::path(saved.display())));
    Ok(0)
}

fn problem(body: &[u8]) -> String {
    serde_json::from_slice::<Json>(body)
        .ok()
        .and_then(|v| v.get("detail").or_else(|| v.get("title")).and_then(Json::as_str).map(String::from))
        .unwrap_or_else(|| String::from_utf8_lossy(body).into_owned())
}

1		//! `spectra connect` and the client configuration (spec §8.6): trust a
2		//! Spectra on another machine because the owner's own identity delegates
3		//! to its instance key and that key vouches for its certificate; pin the
4		//! certificate; claim a server set up with `spectra init --owner`.
5
6		use super::{identity, ui, Ctx};
7		use anyhow::{bail, Context, Result};
8		use serde_json::Value as Json;
9		use spectra_core::daemon::WireEvent;
10		use spectra_core::identity::Identity;
11		use spectra_core::keys::KeyPair;
12		use spectra_core::principals::{identity_payload, signed_event};
13		use spectra_mcp::client::{host_port, Client, Endpoint};
14		use spectra_mcp::tls::Pinned;
15		use std::path::{Path, PathBuf};
16
17		/// The client configuration: which server, and what to trust there.
18		#[derive(Clone, Debug)]
19		pub struct ClientCfg {
20		pub server: String,
21		pub instance: String,
22		pub tls_spki: [u8; 32],
23		}
24
25		impl ClientCfg {
26	20×	pub fn endpoint(&self) -> Result<Endpoint> {
27	20×	Endpoint::tls(&self.server, self.tls_spki)
28	20×	}
29		}
30
31		/// `SPECTRA_SERVER`, else `client.toml` in the owner's identity home.
32	197×	pub fn path() -> PathBuf {
33	197×	if let Some(p) = std::env::var_os("SPECTRA_SERVER").filter(\|p\| !p.is_empty()) {
34	0×	return PathBuf::from(p);
35	197×	}
36	197×	config_dir().join("client.toml")
37	197×	}
38
39		/// The owner's identity home, where the client configuration lives too.
40	197×	fn config_dir() -> PathBuf {
41	197×	spectra_core::keys::default_home()
42	197×	}
43
44		/// The client configuration, if this machine uses a Spectra elsewhere.
45	191×	pub fn load() -> Result<Option<ClientCfg>> {
46	191×	let p = path();
47	191×	let text = match std::fs::read_to_string(&p) {
48	19×	Ok(t) => t,
49	172×	Err(e) if e.kind() == std::io::ErrorKind::NotFound => return Ok(None),
50	0×	Err(e) => return Err(e).with_context(\|\| format!("reading {}", p.display())),
51		};
52	19×	let t: toml::Table = text.parse().with_context(\|\| format!("reading {}", p.display()))?;
53	57×	let get = \|k: &str\| t.get(k).and_then(\|v\| v.as_str()).map(String::from).with_context(\|\| format!("{} has no {k}", p.display()));
54	19×	let spki = hex::decode(get("tls_spki")?).ok().and_then(\|b\| b.try_into().ok()).with_context(\|\| format!("{}: tls_spki", p.display()))?;
55	19×	Ok(Some(ClientCfg { server: get("server")?, instance: get("instance")?, tls_spki: spki }))
56	191×	}
57
58	5×	fn save(cfg: &ClientCfg) -> Result<PathBuf> {
59	5×	let p = path();
60	5×	if let Some(dir) = p.parent() {
61	5×	std::fs::create_dir_all(dir)?;
62	0×	}
63	5×	std::fs::write(
64	5×	&p,
65	5×	format!(
66		"# Spectra on another machine (spec §8.6), written by `spectra connect`.\n\nserver = \"{}\"\ninstance = \"{}\" # the instance key, delegated by the owner\ntls_spki = \"{}\" # the certificate the instance key vouches for\n",
67		cfg.server,
68		cfg.instance,
69	5×	hex::encode(cfg.tls_spki)
70		),
71	0×	)?;
72	5×	Ok(p)
73	5×	}
74
75		/// The key pair of the identity `key` in the owner's home, if it is theirs.
76	9×	fn own(home: &Path, key: &str) -> Option<KeyPair> {
77	9×	let keys = home.join("keys");
78	9×	KeyPair::load(&keys.join(format!("{key}.secret")), &keys.join(format!("{key}.identity"))).ok()
79	9×	}
80
81	8×	pub async fn connect(_ctx: &Ctx, url: &str, owner_home: Option<PathBuf>, expect: Option<String>, yes: bool) -> Result<i32> {
82	8×	let server = format!("https://{}", host_port(url)?);
83	8×	let home = owner_home.unwrap_or_else(spectra_core::keys::default_home);
84	8×	let mut owner = KeyPair::load_home(&home)
85	8×	.with_context(\|\| format!("the owner connects with their own identity: none usable in {} (or --owner-home)", home.display()))?;
86
87		// Who is there, before trusting anything.
88	8×	let probe = Pinned::new(None);
89	8×	let anon = Client::at(Endpoint::Tls { addr: host_port(url)?, config: probe.client_config()? }, None);
90	8×	let r = anon.send("GET", "/api/v1/instance", &[], vec![]).await.with_context(\|\| format!("reaching {server}"))?;
91	8×	if r.status != 200 {
92	0×	bail!("{server} answered {} to /api/v1/instance: is it a Spectra?", r.status);
93	8×	}
94	8×	let answer = r.json()?;
95	8×	let (_, seen) = probe.seen().context("the server showed no certificate")?;
96	8×	let checked = spectra_mcp::instance::check(&answer, &seen)?;
97	8×	let instance_key = checked.instance.hash();
98
99		// Whose it is, or whose it is waiting for.
100	8×	let recorded = checked.owner.clone();
101	8×	let named = answer.get("named_owner").and_then(Json::as_str).map(String::from);
102	8×	match (&recorded, &named) {
103	2×	(Some(k), _) if *k != owner.key.to_hex() && own(&home, k).is_none() => {
104	0×	bail!("{server} belongs to someone else (owner {})", &k[..12.min(k.len())]);
105		}
106	6×	(None, Some(k)) if own(&home, k).is_none() => {
107	1×	bail!(
108		"{server} was set up for {}, which is not an identity in {} (spectra init --owner takes `spectra identity show`'s key)",
109	1×	&k[..12.min(k.len())],
110	1×	home.display()
111		);
112		}
113	0×	(None, None) => bail!("{server} has no owner and names none"),
114	7×	_ => {}
115		}
116
117		// Trust: the owner's own identity delegates to that instance key now.
118	7×	if !owner.identity.delegates_to(&instance_key, spectra_core::ids::now_ms()) {
119	5×	println!("{}", ui::kv("server", ui::path(&server)));
120	5×	println!("{}", ui::kv("instance", format!("{}{}{}", checked.name, ui::sep(), ui::hash(instance_key.to_hex()))));
121	5×	println!(" {} {}", ui::note(), ui::dim("`spectra init` printed this instance's key on the server: check it is the same"));
122	2×	match &expect {
123	2×	Some(prefix) if instance_key.to_hex().starts_with(&prefix.trim().to_ascii_lowercase()) => {}
124	1×	Some(prefix) => bail!("the server's instance key does not start with {prefix}: not trusted"),
125	3×	None => super::agent::confirm(&format!("Trust {} as your Spectra", checked.name), yes)?,
126		}
127	3×	owner = spectra_core::keys::delegate(&home, instance_key, None)?;
128	2×	}
129
130	5×	let cfg = ClientCfg { server: server.clone(), instance: instance_key.to_hex(), tls_spki: seen };
131	5×	let saved = save(&cfg)?;
132	5×	let pinned = cfg.endpoint()?;
133
134		// Claim it, or bring it up to the owner's current identity.
135	5×	let mut claimed = false;
136	5×	match (&recorded, &named) {
137	3×	(None, Some(k)) => {
138	3×	let named_pair = own(&home, k).expect("checked above");
139	3×	let mut events =
140	3×	vec![WireEvent::from_new(&signed_event(&named_pair, "human", "identity.owner", identity_payload(&named_pair.identity)))];
141	3×	if let Some(e) = identity::rotation(&named_pair.identity, &home)? {
142	3×	events.push(WireEvent::from_new(&e));
143	3×	}
144	3×	let r = Client::at(pinned.clone(), None).send("POST", "/api/v1/claim", &[], serde_json::to_vec(&events)?).await?;
145	3×	if r.status != 200 {
146	0×	bail!("{server} refused the claim: {}", problem(&r.body));
147	3×	}
148	3×	claimed = true;
149		}
150	2×	(Some(k), _) if *k != owner.key.to_hex() => {
151	0×	let rec_pair = own(&home, k).expect("checked above");
152	0×	let rec_id: Identity = rec_pair.identity.clone();
153	0×	if let Some(e) = identity::rotation(&rec_id, &home)? {
154	0×	let body = serde_json::to_vec(&vec![WireEvent::from_new(&e)])?;
155	0×	let r = Client::at(pinned.clone(), Some(rec_pair)).send("POST", "/api/v1/ledger/events", &[], body).await?;
156	0×	if r.status != 200 {
157	0×	bail!("{server} refused the owner's current identity: {}", problem(&r.body));
158	0×	}
159	0×	}
160		}
161	2×	_ => {}
162		}
163
164	5×	println!("{} {} {}", ui::done(if claimed { "Claimed" } else { "Connected" }), ui::subject(&checked.name), ui::path(&server));
165	5×	println!("{}", ui::kv("owner", format!("{}{}{}", ui::author(&owner.identity.name), ui::sep(), ui::hash(owner.key.short(12)))));
166	5×	println!("{}", ui::kv("instance", format!("{}{}", ui::hash(instance_key.short(12)), ui::dim(" (delegated by you)"))));
167	5×	println!(
168		"{}",
169	5×	ui::kv("certificate", format!("{}{}", ui::hash(hex::encode(&seen[..8])), ui::dim(" (pinned; vouched for by the instance key)")))
170		);
171	5×	println!("{}", ui::kv("config", ui::path(saved.display())));
172	5×	Ok(0)
173	8×	}
174
175	0×	fn problem(body: &[u8]) -> String {
176	0×	serde_json::from_slice::<Json>(body)
177	0×	.ok()
178	0×	.and_then(\|v\| v.get("detail").or_else(\|\| v.get("title")).and_then(Json::as_str).map(String::from))
179	0×	.unwrap_or_else(\|\| String::from_utf8_lossy(body).into_owned())
180	0×	}

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