[pbs-devel] [PATCH v2 backup 14/27] add acme config
Wolfgang Bumiller
w.bumiller at proxmox.com
Thu Apr 22 16:02:00 CEST 2021
Signed-off-by: Wolfgang Bumiller <w.bumiller at proxmox.com>
---
src/config.rs | 1 +
src/config/acme/mod.rs | 198 ++++++++++++++++++++
src/config/acme/plugin.rs | 380 ++++++++++++++++++++++++++++++++++++++
3 files changed, 579 insertions(+)
create mode 100644 src/config/acme/mod.rs
create mode 100644 src/config/acme/plugin.rs
diff --git a/src/config.rs b/src/config.rs
index 717829e2..94b7fb6c 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -16,6 +16,7 @@ use proxmox::try_block;
use crate::buildcfg;
pub mod acl;
+pub mod acme;
pub mod cached_user_info;
pub mod datastore;
pub mod network;
diff --git a/src/config/acme/mod.rs b/src/config/acme/mod.rs
new file mode 100644
index 00000000..ac409c20
--- /dev/null
+++ b/src/config/acme/mod.rs
@@ -0,0 +1,198 @@
+use std::collections::HashMap;
+use std::fmt;
+use std::path::Path;
+
+use anyhow::{bail, format_err, Error};
+use serde::{Deserialize, Serialize};
+
+use proxmox::api::api;
+use proxmox::sys::error::SysError;
+
+use crate::api2::types::{PROXMOX_SAFE_ID_FORMAT, PROXMOX_SAFE_ID_REGEX};
+use crate::tools::ControlFlow;
+
+pub(crate) const ACME_ACCOUNT_DIR: &str = configdir!("/acme/accounts");
+
+pub mod plugin;
+
+#[api(
+ properties: {
+ name: { type: String },
+ url: { type: String },
+ },
+)]
+/// An ACME directory endpoint with a name and URL.
+#[derive(Serialize)]
+pub struct KnownAcmeDirectory {
+ /// The ACME directory's name.
+ pub name: &'static str,
+
+ /// The ACME directory's endpoint URL.
+ pub url: &'static str,
+}
+
+pub const KNOWN_ACME_DIRECTORIES: &[KnownAcmeDirectory] = &[
+ KnownAcmeDirectory {
+ name: "Let's Encrypt V2",
+ url: "https://acme-v02.api.letsencrypt.org/directory",
+ },
+ KnownAcmeDirectory {
+ name: "Let's Encrypt V2 Staging",
+ url: "https://acme-staging-v02.api.letsencrypt.org/directory",
+ },
+];
+
+pub const DEFAULT_ACME_DIRECTORY_ENTRY: &KnownAcmeDirectory = &KNOWN_ACME_DIRECTORIES[0];
+
+pub fn account_path(name: &str) -> String {
+ format!("{}/{}", ACME_ACCOUNT_DIR, name)
+}
+
+#[api(format: &PROXMOX_SAFE_ID_FORMAT)]
+/// ACME account name.
+#[derive(Clone, Eq, PartialEq, Hash, Deserialize, Serialize)]
+#[serde(transparent)]
+pub struct AccountName(String);
+
+impl AccountName {
+ pub fn into_string(self) -> String {
+ self.0
+ }
+}
+
+impl std::ops::Deref for AccountName {
+ type Target = str;
+
+ #[inline]
+ fn deref(&self) -> &str {
+ &self.0
+ }
+}
+
+impl std::ops::DerefMut for AccountName {
+ #[inline]
+ fn deref_mut(&mut self) -> &mut str {
+ &mut self.0
+ }
+}
+
+impl AsRef<str> for AccountName {
+ #[inline]
+ fn as_ref(&self) -> &str {
+ self.0.as_ref()
+ }
+}
+
+impl fmt::Debug for AccountName {
+ #[inline]
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Debug::fmt(&self.0, f)
+ }
+}
+
+impl fmt::Display for AccountName {
+ #[inline]
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ fmt::Display::fmt(&self.0, f)
+ }
+}
+
+pub fn foreach_acme_account<F>(mut func: F) -> Result<(), Error>
+where
+ F: FnMut(AccountName) -> ControlFlow<Result<(), Error>>,
+{
+ match crate::tools::fs::scan_subdir(-1, ACME_ACCOUNT_DIR, &PROXMOX_SAFE_ID_REGEX) {
+ Ok(files) => {
+ for file in files {
+ let file = file?;
+ let file_name = unsafe { file.file_name_utf8_unchecked() };
+
+ if file_name.starts_with('_') {
+ continue;
+ }
+
+ let account_name = AccountName(file_name.to_owned());
+
+ if let ControlFlow::Break(result) = func(account_name) {
+ return result;
+ }
+ }
+ Ok(())
+ }
+ Err(err) if err.not_found() => Ok(()),
+ Err(err) => Err(err.into()),
+ }
+}
+
+/// Run a function for each DNS plugin ID.
+pub fn foreach_dns_plugin<F>(mut func: F) -> Result<(), Error>
+where
+ F: FnMut(&str) -> ControlFlow<Result<(), Error>>,
+{
+ match crate::tools::fs::read_subdir(-1, "/usr/share/proxmox-acme/dnsapi") {
+ Ok(files) => {
+ for file in files.filter_map(Result::ok) {
+ if let Some(id) = file
+ .file_name()
+ .to_str()
+ .ok()
+ .and_then(|name| name.strip_prefix("dns_"))
+ .and_then(|name| name.strip_suffix(".sh"))
+ {
+ if let ControlFlow::Break(result) = func(id) {
+ return result;
+ }
+ }
+ }
+
+ Ok(())
+ }
+ Err(err) if err.not_found() => Ok(()),
+ Err(err) => Err(err.into()),
+ }
+}
+
+pub fn mark_account_deactivated(name: &str) -> Result<(), Error> {
+ let from = account_path(name);
+ for i in 0..100 {
+ let to = account_path(&format!("_deactivated_{}_{}", name, i));
+ if !Path::new(&to).exists() {
+ return std::fs::rename(&from, &to).map_err(|err| {
+ format_err!(
+ "failed to move account path {:?} to {:?} - {}",
+ from,
+ to,
+ err
+ )
+ });
+ }
+ }
+ bail!(
+ "No free slot to rename deactivated account {:?}, please cleanup {:?}",
+ from,
+ ACME_ACCOUNT_DIR
+ );
+}
+
+pub fn complete_acme_account(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+ let mut out = Vec::new();
+ let _ = foreach_acme_account(|name| {
+ out.push(name.into_string());
+ ControlFlow::CONTINUE
+ });
+ out
+}
+
+pub fn complete_acme_plugin(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+ match plugin::config() {
+ Ok((config, _digest)) => config
+ .iter()
+ .map(|(id, (_type, _cfg))| id.clone())
+ .collect(),
+ Err(_) => Vec::new(),
+ }
+}
+
+pub fn complete_acme_plugin_type(_arg: &str, _param: &HashMap<String, String>) -> Vec<String> {
+ vec!["dns".to_string(), "http".to_string()]
+}
diff --git a/src/config/acme/plugin.rs b/src/config/acme/plugin.rs
new file mode 100644
index 00000000..b0c655c0
--- /dev/null
+++ b/src/config/acme/plugin.rs
@@ -0,0 +1,380 @@
+use std::future::Future;
+use std::pin::Pin;
+use std::process::Stdio;
+
+use anyhow::{bail, format_err, Error};
+use lazy_static::lazy_static;
+use serde::{Deserialize, Serialize};
+use serde_json::Value;
+use tokio::io::AsyncWriteExt;
+use tokio::process::Command;
+
+use proxmox::api::{
+ api,
+ schema::*,
+ section_config::{SectionConfig, SectionConfigData, SectionConfigPlugin},
+};
+
+use proxmox::tools::{fs::replace_file, fs::CreateOptions};
+
+use proxmox_acme_rs::{Authorization, Challenge};
+
+use crate::acme::AcmeClient;
+use crate::api2::types::PROXMOX_SAFE_ID_FORMAT;
+use crate::config::node::AcmeDomain;
+
+const ACME_PATH: &str = "/usr/share/proxmox-acme/proxmox-acme";
+
+pub const PLUGIN_ID_SCHEMA: Schema = StringSchema::new("ACME Challenge Plugin ID.")
+ .format(&PROXMOX_SAFE_ID_FORMAT)
+ .schema();
+
+lazy_static! {
+ pub static ref CONFIG: SectionConfig = init();
+}
+
+#[api(
+ properties: {
+ id: { schema: PLUGIN_ID_SCHEMA },
+ },
+)]
+#[derive(Deserialize, Serialize)]
+/// Standalone ACME Plugin for the http-1 challenge.
+pub struct StandalonePlugin {
+ /// Plugin ID.
+ id: String,
+}
+
+impl Default for StandalonePlugin {
+ fn default() -> Self {
+ Self {
+ id: "standalone".to_string(),
+ }
+ }
+}
+
+/// In PVE/PMG we store the plugin's "data" member as base64url encoded string. The UI sends
+/// regular base64 encoded data. We need to "fix" this up.
+
+#[api(
+ properties: {
+ id: { schema: PLUGIN_ID_SCHEMA },
+ disable: {
+ optional: true,
+ default: false,
+ },
+ "validation-delay": {
+ default: 30,
+ optional: true,
+ minimum: 0,
+ maximum: 2 * 24 * 60 * 60,
+ },
+ },
+)]
+/// DNS ACME Challenge Plugin core data.
+#[derive(Deserialize, Serialize, Updater)]
+#[serde(rename_all = "kebab-case")]
+pub struct DnsPluginCore {
+ /// Plugin ID.
+ pub(crate) id: String,
+
+ /// DNS API Plugin Id.
+ api: String,
+
+ /// Extra delay in seconds to wait before requesting validation.
+ ///
+ /// Allows to cope with long TTL of DNS records.
+ #[serde(skip_serializing_if = "Option::is_none", default)]
+ validation_delay: Option<u32>,
+
+ /// Flag to disable the config.
+ #[serde(skip_serializing_if = "Option::is_none", default)]
+ disable: Option<bool>,
+}
+
+#[api(
+ properties: {
+ core: { type: DnsPluginCore },
+ },
+)]
+/// DNS ACME Challenge Plugin.
+#[derive(Deserialize, Serialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct DnsPlugin {
+ #[serde(flatten)]
+ pub(crate) core: DnsPluginCore,
+
+ // FIXME: The `Updater` should allow:
+ // * having different descriptions for this and the Updater version
+ // * having different `#[serde]` attributes for the Updater
+ // * or, well, leaving fields out completely in teh Updater but this means we may need to
+ // separate Updater and Builder deriving.
+ // We handle this property separately in the API calls.
+ /// DNS plugin data (base64url encoded without padding).
+ #[serde(with = "proxmox::tools::serde::string_as_base64url_nopad")]
+ pub(crate) data: String,
+}
+
+impl DnsPlugin {
+ pub fn decode_data(&self, output: &mut Vec<u8>) -> Result<(), Error> {
+ Ok(base64::decode_config_buf(&self.data, base64::URL_SAFE_NO_PAD, output)?)
+ }
+}
+
+//impl DnsPluginUpdater {
+// // The UI passes regular base64 data, we need base64url data. In PVE/PMG this happens magically
+// // since perl parses both on decode...
+// pub fn api_fixup(&mut self) -> Result<(), Error> {
+// if let Some(data) = self.data.as_mut() {
+// let new = base64::encode_config(&base64::decode(&data)?, base64::URL_SAFE_NO_PAD);
+// *data = new;
+// }
+// Ok(())
+// }
+//}
+
+fn init() -> SectionConfig {
+ let mut config = SectionConfig::new(&PLUGIN_ID_SCHEMA);
+
+ let standalone_schema = match &StandalonePlugin::API_SCHEMA {
+ Schema::Object(schema) => schema,
+ _ => unreachable!(),
+ };
+ let standalone_plugin = SectionConfigPlugin::new(
+ "standalone".to_string(),
+ Some("id".to_string()),
+ standalone_schema,
+ );
+ config.register_plugin(standalone_plugin);
+
+ let dns_challenge_schema = match DnsPlugin::API_SCHEMA {
+ Schema::AllOf(ref schema) => schema,
+ _ => unreachable!(),
+ };
+ let dns_challenge_plugin = SectionConfigPlugin::new(
+ "dns".to_string(),
+ Some("id".to_string()),
+ dns_challenge_schema,
+ );
+ config.register_plugin(dns_challenge_plugin);
+
+ config
+}
+
+pub const ACME_PLUGIN_CFG_FILENAME: &str = "/etc/proxmox-backup/acme/plugins.cfg";
+pub const ACME_PLUGIN_CFG_LOCKFILE: &str = "/etc/proxmox-backup/acme/.plugins.lck";
+const LOCK_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(5);
+
+pub fn read_lock() -> Result<std::fs::File, Error> {
+ proxmox::tools::fs::open_file_locked(ACME_PLUGIN_CFG_LOCKFILE, LOCK_TIMEOUT, false)
+}
+
+pub fn write_lock() -> Result<std::fs::File, Error> {
+ proxmox::tools::fs::open_file_locked(ACME_PLUGIN_CFG_LOCKFILE, LOCK_TIMEOUT, true)
+}
+
+pub fn config() -> Result<(PluginData, [u8; 32]), Error> {
+ let content = proxmox::tools::fs::file_read_optional_string(ACME_PLUGIN_CFG_FILENAME)?
+ .unwrap_or_else(|| "".to_string());
+
+ let digest = openssl::sha::sha256(content.as_bytes());
+ let mut data = CONFIG.parse(ACME_PLUGIN_CFG_FILENAME, &content)?;
+
+ if data.sections.get("standalone").is_none() {
+ let standalone = StandalonePlugin::default();
+ data.set_data("standalone", "standalone", &standalone)
+ .unwrap();
+ }
+
+ Ok((PluginData { data }, digest))
+}
+
+pub fn save_config(config: &PluginData) -> Result<(), Error> {
+ let raw = CONFIG.write(ACME_PLUGIN_CFG_FILENAME, &config.data)?;
+
+ let backup_user = crate::backup::backup_user()?;
+ let mode = nix::sys::stat::Mode::from_bits_truncate(0o0640);
+ // set the correct owner/group/permissions while saving file
+ // owner(rw) = root, group(r)= backup
+ let options = CreateOptions::new()
+ .perm(mode)
+ .owner(nix::unistd::ROOT)
+ .group(backup_user.gid);
+
+ replace_file(ACME_PLUGIN_CFG_FILENAME, raw.as_bytes(), options)?;
+
+ Ok(())
+}
+
+pub struct PluginData {
+ data: SectionConfigData,
+}
+
+impl PluginData {
+ #[inline]
+ pub fn remove(&mut self, name: &str) -> Option<(String, Value)> {
+ self.data.sections.remove(name)
+ }
+
+ #[inline]
+ pub fn contains_key(&mut self, name: &str) -> bool {
+ self.data.sections.contains_key(name)
+ }
+
+ #[inline]
+ pub fn get(&self, name: &str) -> Option<&(String, Value)> {
+ self.data.sections.get(name)
+ }
+
+ #[inline]
+ pub fn get_mut(&mut self, name: &str) -> Option<&mut (String, Value)> {
+ self.data.sections.get_mut(name)
+ }
+
+ // FIXME: Verify the plugin type *exists* and check its config schema...
+ pub fn insert(&mut self, id: String, ty: String, plugin: Value) {
+ self.data.sections.insert(id, (ty, plugin));
+ }
+
+ pub fn get_plugin(
+ &self,
+ name: &str,
+ ) -> Result<Option<Box<dyn AcmePlugin + Send + Sync + 'static>>, Error> {
+ let (ty, data) = match self.get(name) {
+ Some(plugin) => plugin,
+ None => return Ok(None),
+ };
+
+ Ok(Some(match ty.as_str() {
+ "dns" => {
+ let plugin: DnsPlugin = serde_json::from_value(data.clone())?;
+ Box::new(plugin)
+ }
+ // "standalone" => todo!("standalone plugin"),
+ other => bail!("missing implementation for plugin type '{}'", other),
+ }))
+ }
+
+ pub fn iter(&self) -> impl Iterator<Item = (&String, &(String, Value))> + Send {
+ self.data.sections.iter()
+ }
+}
+
+pub trait AcmePlugin {
+ /// Setup everything required to trigger the validation and return the corresponding validation
+ /// URL.
+ fn setup<'fut, 'a: 'fut, 'b: 'fut, 'c: 'fut, 'd: 'fut>(
+ &'a self,
+ client: &'b mut AcmeClient,
+ authorization: &'c Authorization,
+ domain: &'d AcmeDomain,
+ ) -> Pin<Box<dyn Future<Output = Result<&'c str, Error>> + Send + 'fut>>;
+
+ fn teardown<'fut, 'a: 'fut, 'b: 'fut, 'c: 'fut, 'd: 'fut>(
+ &'a self,
+ client: &'b mut AcmeClient,
+ authorization: &'c Authorization,
+ domain: &'d AcmeDomain,
+ ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'fut>>;
+}
+
+impl DnsPlugin {
+ fn extract_challenge(authorization: &Authorization) -> Result<&Challenge, Error> {
+ authorization
+ .challenges
+ .iter()
+ .find(|ch| ch.ty == "dns-01")
+ .ok_or_else(|| format_err!("no supported challenge type (dns-01) found"))
+ }
+
+ async fn action<'a>(
+ &self,
+ client: &mut AcmeClient,
+ authorization: &'a Authorization,
+ domain: &AcmeDomain,
+ action: &str,
+ ) -> Result<&'a str, Error> {
+ let challenge = Self::extract_challenge(authorization)?;
+ let mut stdin_data = client
+ .dns_01_txt_value(
+ challenge
+ .token()
+ .ok_or_else(|| format_err!("missing token in challenge"))?,
+ )?
+ .into_bytes();
+ stdin_data.push(b'\n');
+ stdin_data.extend(self.data.as_bytes());
+ if stdin_data.last() != Some(&b'\n') {
+ stdin_data.push(b'\n');
+ }
+
+ let mut command = Command::new("/usr/bin/setpriv");
+
+ #[rustfmt::skip]
+ command.args(&[
+ "--reuid", "nobody",
+ "--regid", "nogroup",
+ "--clear-groups",
+ "--reset-env",
+ "--",
+ "/bin/bash",
+ ACME_PATH,
+ action,
+ &self.core.api,
+ domain.alias.as_deref().unwrap_or(&domain.domain),
+ ]);
+
+ let mut child = command.stdin(Stdio::piped()).spawn()?;
+
+ let mut stdin = child.stdin.take().expect("Stdio::piped()");
+ match async move {
+ stdin.write_all(&stdin_data).await?;
+ stdin.flush().await?;
+ Ok::<_, std::io::Error>(())
+ }.await {
+ Ok(()) => (),
+ Err(err) => {
+ if let Err(err) = child.kill().await {
+ eprintln!("failed to kill '{} {}' command: {}", ACME_PATH, action, err);
+ }
+ bail!("'{}' failed: {}", ACME_PATH, err);
+ }
+ }
+
+ let status = child.wait().await?;
+ if !status.success() {
+ bail!(
+ "'{} {}' exited with error ({})",
+ ACME_PATH,
+ action,
+ status.code().unwrap_or(-1)
+ );
+ }
+
+ Ok(&challenge.url)
+ }
+}
+
+impl AcmePlugin for DnsPlugin {
+ fn setup<'fut, 'a: 'fut, 'b: 'fut, 'c: 'fut, 'd: 'fut>(
+ &'a self,
+ client: &'b mut AcmeClient,
+ authorization: &'c Authorization,
+ domain: &'d AcmeDomain,
+ ) -> Pin<Box<dyn Future<Output = Result<&'c str, Error>> + Send + 'fut>> {
+ Box::pin(self.action(client, authorization, domain, "setup"))
+ }
+
+ fn teardown<'fut, 'a: 'fut, 'b: 'fut, 'c: 'fut, 'd: 'fut>(
+ &'a self,
+ client: &'b mut AcmeClient,
+ authorization: &'c Authorization,
+ domain: &'d AcmeDomain,
+ ) -> Pin<Box<dyn Future<Output = Result<(), Error>> + Send + 'fut>> {
+ Box::pin(async move {
+ self.action(client, authorization, domain, "teardown")
+ .await
+ .map(drop)
+ })
+ }
+}
--
2.20.1
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