Feature/ssh (#382)

* wip ssh feature

* add and remove complete, list remains

* list half way done

* should finish the ssh module completely

* minor fixes

* formatting and offline queries

Co-authored-by: Aiden McClelland <me@drbonez.dev>

appmgr/src/error.rs

@@ -47,6 +47,7 @@ pub enum ErrorKind {
     MigrationFailed = 39,
     Uninitialized = 40,
     ParseNetAddress = 41,
+    ParseSshKey = 42,
 }
 impl ErrorKind {
     pub fn as_str(&self) -> &'static str {
@@ -93,6 +94,7 @@ impl ErrorKind {
             MigrationFailed => "Migration Failed",
             Uninitialized => "Uninitialized",
             ParseNetAddress => "Net Address Parsing Error",
+            ParseSshKey => "SSH Key Parsing Error",
         }
     }
 }

appmgr/src/lib.rs

@@ -35,6 +35,7 @@ pub mod migration;
 pub mod net;
 pub mod registry;
 pub mod s9pk;
+pub mod ssh;
 pub mod status;
 pub mod util;
 pub mod version;

appmgr/src/ssh.rs

@@ -0,0 +1,177 @@
+use std::path::Path;
+
+use anyhow::anyhow;
+use clap::ArgMatches;
+use rpc_toolkit::command;
+use sqlx::{Pool, Sqlite};
+
+use crate::context::EitherContext;
+use crate::util::{display_none, display_serializable, IoFormat};
+use crate::Error;
+
+static SSH_AUTHORIZED_KEYS_FILE: &str = "~/.ssh/authorized_keys";
+
+#[derive(serde::Deserialize, serde::Serialize)]
+pub struct PubKey(
+    #[serde(serialize_with = "crate::util::serialize_display")]
+    #[serde(deserialize_with = "crate::util::deserialize_from_str")]
+    openssh_keys::PublicKey,
+);
+
+#[derive(serde::Serialize, serde::Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct SshKeyResponse {
+    pub alg: String,
+    pub hash: String,
+    pub hostname: String,
+    pub created_at: String,
+}
+impl std::fmt::Display for SshKeyResponse {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(
+            f,
+            "{} {} {} {}",
+            self.created_at, self.alg, self.hash, self.hostname
+        )
+    }
+}
+
+impl std::str::FromStr for PubKey {
+    type Err = Error;
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        s.parse().map(|pk| PubKey(pk)).map_err(|e| Error {
+            source: e.into(),
+            kind: crate::ErrorKind::ParseSshKey,
+            revision: None,
+        })
+    }
+}
+
+#[command(subcommands(add, remove, list,))]
+pub fn ssh(#[context] ctx: EitherContext) -> Result<EitherContext, Error> {
+    Ok(ctx)
+}
+
+#[command(display(display_none))]
+pub async fn add(#[context] ctx: EitherContext, #[arg] key: PubKey) -> Result<String, Error> {
+    let pool = &ctx.as_rpc().unwrap().secret_store;
+    // check fingerprint for duplicates
+    let fp = key.0.fingerprint_md5();
+    if sqlx::query!("SELECT * FROM ssh_keys WHERE fingerprint = ?", fp)
+        .fetch_optional(pool)
+        .await?
+        .is_none()
+    {
+        // if no duplicates, insert into DB
+        let raw_key = format!("{}", key.0);
+        sqlx::query!(
+            "INSERT INTO ssh_keys (fingerprint, openssh_pubkey, created_at) VALUES (?, ?, datetime('now'))"
+        , fp, raw_key).execute(pool).await?;
+        // insert into live key file, for now we actually do a wholesale replacement of the keys file, for maximum
+        // consistency
+        sync_keys_from_db(pool, Path::new(SSH_AUTHORIZED_KEYS_FILE)).await?;
+    }
+    // return fingerprint
+    Ok(fp)
+}
+#[command(display(display_none))]
+pub async fn remove(
+    #[context] ctx: EitherContext,
+    #[arg] fingerprint: String,
+) -> Result<(), Error> {
+    let pool = &ctx.as_rpc().unwrap().secret_store;
+    // check if fingerprint is in DB
+    // if in DB, remove it from DB
+    let n = sqlx::query!("DELETE FROM ssh_keys WHERE fingerprint = ?", fingerprint)
+        .execute(pool)
+        .await?
+        .rows_affected();
+    // if not in DB, Err404
+    if n == 0 {
+        Err(Error {
+            source: anyhow::anyhow!("SSH Key Not Found"),
+            kind: crate::error::ErrorKind::NotFound,
+            revision: None,
+        })
+    } else {
+        // AND overlay key file
+        sync_keys_from_db(pool, Path::new(SSH_AUTHORIZED_KEYS_FILE)).await?;
+        Ok(())
+    }
+}
+
+fn display_all_ssh_keys(all: Vec<SshKeyResponse>, matches: &ArgMatches<'_>) {
+    use prettytable::*;
+
+    if matches.is_present("format") {
+        return display_serializable(all, matches);
+    }
+
+    let mut table = Table::new();
+    table.add_row(row![bc =>
+        "CREATED AT",
+        "ALGORITHM",
+        "HASH",
+        "HOSTNAME",
+    ]);
+    for key in all {
+        let row = row![
+            &format!("{}", key.created_at),
+            &key.alg,
+            &key.hash,
+            &key.hostname,
+        ];
+        table.add_row(row);
+    }
+    table.print_tty(false);
+}
+
+#[command(display(display_all_ssh_keys))]
+pub async fn list(
+    #[context] ctx: EitherContext,
+    #[allow(unused_variables)]
+    #[arg(long = "format")]
+    format: Option<IoFormat>,
+) -> Result<Vec<SshKeyResponse>, Error> {
+    let pool = &ctx.as_rpc().unwrap().secret_store;
+    // list keys in DB and return them
+    let entries = sqlx::query!("SELECT fingerprint, openssh_pubkey, created_at FROM ssh_keys")
+        .fetch_all(pool)
+        .await?;
+    Ok(entries
+        .into_iter()
+        .map(|r| {
+            let k = PubKey(r.openssh_pubkey.parse().unwrap()).0;
+            let alg = k.keytype().to_owned();
+            let hash = k.fingerprint();
+            let hostname = k.comment.unwrap_or("".to_owned());
+            let created_at = r.created_at;
+            SshKeyResponse {
+                alg,
+                hash,
+                hostname,
+                created_at,
+            }
+        })
+        .collect())
+}
+
+pub async fn sync_keys_from_db(pool: &Pool<Sqlite>, dest: &Path) -> Result<(), Error> {
+    let keys = sqlx::query!("SELECT openssh_pubkey FROM ssh_keys")
+        .fetch_all(pool)
+        .await?;
+    let contents: String = keys
+        .into_iter()
+        .map(|k| format!("{}\n", k.openssh_pubkey))
+        .collect();
+    let ssh_dir = dest.parent().ok_or_else(|| {
+        Error::new(
+            anyhow!("SSH Key File cannot be \"/\""),
+            crate::ErrorKind::Filesystem,
+        )
+    })?;
+    if tokio::fs::metadata(ssh_dir).await.is_err() {
+        tokio::fs::create_dir_all(ssh_dir).await?;
+    }
+    std::fs::write(dest, contents).map_err(|e| e.into())
+}