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

use anyhow::Context;
use wasmer_api::backend::BackendClient;

use crate::{config::DeployClientConfig, ApiOpts};

use super::AsyncCliCommand;

/// Start a remote SSH session.
#[derive(clap::Parser, Debug)]
pub struct CmdSsh {
    #[clap(flatten)]
    api: ApiOpts,
    /// SSH port to use.
    #[clap(long, default_value = "22")]
    pub ssh_port: u16,
    /// SSH Host
    #[clap(long, default_value = "root.wasmer.network")]
    pub host: String,
    /// Local port mapping to the package that's running, this allows
    /// for instance a HTTP server to be tested remotely while giving
    /// instant logs over stderr channelled via SSH.
    #[clap(long)]
    pub map_port: Vec<u16>,
    /// Package to run on the Deploy servers
    #[clap(index = 1, default_value = "sharrattj/bash")]
    pub run: String,
    /// Arguments to pass the package running on Deploy
    #[clap(index = 2, trailing_var_arg = true)]
    pub run_args: Vec<String>,
    /// Prints the SSH command rather than executing it
    #[clap(short, long)]
    pub print: bool,
}

impl CmdSsh {
    async fn exec(self) -> Result<(), anyhow::Error> {
        let mut config = crate::config::load_config(None)?;
        let client = self.api.client()?;

        let (token, is_new) = acquire_ssh_token(&client, &config.config).await?;

        let host = self.host;
        let port = self.ssh_port;

        if is_new {
            eprintln!("Acquired new SSH token");
            config.set_ssh_token(token.clone())?;
            if let Err(err) = config.save() {
                eprintln!("Warning: failed to save config: {err}");
            }
        }

        let mut cmd = std::process::Command::new("ssh");
        let mut cmd = cmd
            .args([
                // No controlpath becaue we don't want to re-use connections
                "-o",
                "ControlPath=none",
                // Disable host key checking, because we use a DNS-load-balanced
                // host.
                "-o",
                "StrictHostKeyChecking=no",
                // Don't persist known hosts - don't want to clutter users
                // regular ssh data.
                "-o",
                "UserKnownHostsFile=/dev/null",
                "-o",
                "IdentitiesOnly=yes",
                // Don't print ssh related output.
                "-q",
            ])
            .args(["-p", format!("{port}").as_str()]);
        for map_port in self.map_port {
            cmd = cmd.args([
                "-L",
                format!("{}:localhost:{}", map_port, map_port).as_str(),
            ]);
        }

        cmd = cmd.arg(format!("{token}@{host}")).arg(self.run.as_str());
        for run_arg in self.run_args {
            cmd = cmd.arg(&run_arg);
        }

        if self.print {
            print!("ssh");
            for arg in cmd.get_args() {
                print!(" {}", arg.to_string_lossy().as_ref());
            }
            println!();
            return Ok(());
        }

        let exit = cmd.spawn()?.wait()?;
        if exit.success() {
            Ok(())
        } else {
            Err(anyhow::anyhow!("ssh failed with status {}", exit))
        }
    }
}

type IsNew = bool;
type RawToken = String;

impl AsyncCliCommand for CmdSsh {
    fn run_async(self) -> futures::future::BoxFuture<'static, Result<(), anyhow::Error>> {
        Box::pin(self.exec())
    }
}

async fn acquire_ssh_token(
    client: &BackendClient,
    config: &DeployClientConfig,
) -> Result<(RawToken, IsNew), anyhow::Error> {
    if let Some(token) = &config.ssh_token {
        // TODO: validate that token is still valid.
        return Ok((token.clone(), false));
    }

    let token = create_ssh_token(client).await?;
    Ok((token, true))
}

/// Create a new token for SSH access through the backend API.
async fn create_ssh_token(client: &BackendClient) -> Result<RawToken, anyhow::Error> {
    wasmer_api::backend::generate_deploy_config_token_raw(
        client,
        wasmer_api::backend::TokenKind::SSH,
    )
    .await
    .context("Could not create token for ssh access")
}