diff --git a/proxmox-notify/Cargo.toml b/proxmox-notify/Cargo.toml index d3eae584..e55be0cc 100644 --- a/proxmox-notify/Cargo.toml +++ b/proxmox-notify/Cargo.toml @@ -9,6 +9,7 @@ exclude.workspace = true [dependencies] anyhow.workspace = true +base64.workspace = true const_format.workspace = true handlebars = { workspace = true } lettre = { workspace = true, optional = true } diff --git a/proxmox-notify/src/endpoints/sendmail.rs b/proxmox-notify/src/endpoints/sendmail.rs index da0c0cc7..e75902fc 100644 --- a/proxmox-notify/src/endpoints/sendmail.rs +++ b/proxmox-notify/src/endpoints/sendmail.rs @@ -1,3 +1,6 @@ +use std::io::Write; +use std::process::{Command, Stdio}; + use serde::{Deserialize, Serialize}; use proxmox_schema::api_types::COMMENT_SCHEMA; @@ -133,7 +136,7 @@ impl Endpoint for SendmailEndpoint { .clone() .unwrap_or_else(|| context().default_sendmail_author()); - proxmox_sys::email::sendmail( + sendmail( &recipients_str, &subject, Some(&text_part), @@ -145,7 +148,7 @@ impl Endpoint for SendmailEndpoint { } #[cfg(feature = "mail-forwarder")] Content::ForwardedMail { raw, uid, .. } => { - proxmox_sys::email::forward(&recipients_str, &mailfrom, raw, *uid) + forward(&recipients_str, &mailfrom, raw, *uid) .map_err(|err| Error::NotifyFailed(self.config.name.clone(), err.into())) } } @@ -160,3 +163,185 @@ impl Endpoint for SendmailEndpoint { self.config.disable.unwrap_or_default() } } + +/// Sends multi-part mail with text and/or html to a list of recipients +/// +/// Includes the header `Auto-Submitted: auto-generated`, so that auto-replies +/// (i.e. OOO replies) won't trigger. +/// ``sendmail`` is used for sending the mail. +fn sendmail( + mailto: &[&str], + subject: &str, + text: Option<&str>, + html: Option<&str>, + mailfrom: Option<&str>, + author: Option<&str>, +) -> Result<(), Error> { + use std::fmt::Write as _; + + if mailto.is_empty() { + return Err(Error::Generic( + "At least one recipient has to be specified!".into(), + )); + } + let mailfrom = mailfrom.unwrap_or("root"); + let recipients = mailto.join(","); + let author = author.unwrap_or("Proxmox Backup Server"); + + let now = proxmox_time::epoch_i64(); + + let mut sendmail_process = match Command::new("/usr/sbin/sendmail") + .arg("-B") + .arg("8BITMIME") + .arg("-f") + .arg(mailfrom) + .arg("--") + .args(mailto) + .stdin(Stdio::piped()) + .spawn() + { + Err(err) => { + return Err(Error::Generic(format!( + "could not spawn sendmail process: {err}" + ))) + } + Ok(process) => process, + }; + let mut is_multipart = false; + if let (Some(_), Some(_)) = (text, html) { + is_multipart = true; + } + + let mut body = String::new(); + let boundary = format!("----_=_NextPart_001_{}", now); + if is_multipart { + body.push_str("Content-Type: multipart/alternative;\n"); + let _ = writeln!(body, "\tboundary=\"{}\"", boundary); + body.push_str("MIME-Version: 1.0\n"); + } else if !subject.is_ascii() { + body.push_str("MIME-Version: 1.0\n"); + } + if !subject.is_ascii() { + let _ = writeln!(body, "Subject: =?utf-8?B?{}?=", base64::encode(subject)); + } else { + let _ = writeln!(body, "Subject: {}", subject); + } + let _ = writeln!(body, "From: {} <{}>", author, mailfrom); + let _ = writeln!(body, "To: {}", &recipients); + let rfc2822_date = proxmox_time::epoch_to_rfc2822(now) + .map_err(|err| Error::Generic(format!("failed to format time: {err}")))?; + let _ = writeln!(body, "Date: {}", rfc2822_date); + body.push_str("Auto-Submitted: auto-generated;\n"); + + if is_multipart { + body.push('\n'); + body.push_str("This is a multi-part message in MIME format.\n"); + let _ = write!(body, "\n--{}\n", boundary); + } + if let Some(text) = text { + body.push_str("Content-Type: text/plain;\n"); + body.push_str("\tcharset=\"UTF-8\"\n"); + body.push_str("Content-Transfer-Encoding: 8bit\n"); + body.push('\n'); + body.push_str(text); + if is_multipart { + let _ = write!(body, "\n--{}\n", boundary); + } + } + if let Some(html) = html { + body.push_str("Content-Type: text/html;\n"); + body.push_str("\tcharset=\"UTF-8\"\n"); + body.push_str("Content-Transfer-Encoding: 8bit\n"); + body.push('\n'); + body.push_str(html); + if is_multipart { + let _ = write!(body, "\n--{}--", boundary); + } + } + + if let Err(err) = sendmail_process + .stdin + .take() + .unwrap() + .write_all(body.as_bytes()) + { + return Err(Error::Generic(format!( + "couldn't write to sendmail stdin: {err}" + ))); + }; + + // wait() closes stdin of the child + if let Err(err) = sendmail_process.wait() { + return Err(Error::Generic(format!( + "sendmail did not exit successfully: {err}" + ))); + } + + Ok(()) +} + +/// Forwards an email message to a given list of recipients. +/// +/// ``sendmail`` is used for sending the mail, thus `message` must be +/// compatible with that (the message is piped into stdin unmodified). +#[cfg(feature = "mail-forwarder")] +fn forward(mailto: &[&str], mailfrom: &str, message: &[u8], uid: Option) -> Result<(), Error> { + use std::os::unix::process::CommandExt; + + if mailto.is_empty() { + return Err(Error::Generic( + "At least one recipient has to be specified!".into(), + )); + } + + let mut builder = Command::new("/usr/sbin/sendmail"); + + builder + .args([ + "-N", "never", // never send DSN (avoid mail loops) + "-f", mailfrom, "--", + ]) + .args(mailto) + .stdin(Stdio::piped()) + .stdout(Stdio::null()) + .stderr(Stdio::null()); + + if let Some(uid) = uid { + builder.uid(uid); + } + + let mut process = builder + .spawn() + .map_err(|err| Error::Generic(format!("could not spawn sendmail process: {err}")))?; + + process + .stdin + .take() + .unwrap() + .write_all(message) + .map_err(|err| Error::Generic(format!("couldn't write to sendmail stdin: {err}")))?; + + process + .wait() + .map_err(|err| Error::Generic(format!("sendmail did not exit successfully: {err}")))?; + + Ok(()) +} + +#[cfg(test)] +mod test { + use super::*; + + #[test] + fn email_without_recipients() { + let result = sendmail( + &[], + "Subject2", + None, + Some("HTML"), + None, + Some("test1"), + ); + assert!(result.is_err()); + } +}