src/bin/proxmox-backup-proxy.rs: create self signed cert at startup.

src/config.rs

@@ -4,7 +4,13 @@
 //! configuration files.
 
 use failure::*;
+use std::path::PathBuf;
+use nix::sys::stat::Mode;
+use openssl::rsa::{Rsa};
+use openssl::x509::{X509Builder};
+use openssl::pkey::PKey;
 
+use proxmox::tools::fs::{CreateOptions, replace_file};
 use proxmox::tools::try_block;
 
 use crate::buildcfg;
@@ -49,8 +55,6 @@ pub fn check_configdir_permissions() -> Result<(), Error> {
 }
 
 pub fn create_configdir() -> Result<(), Error> {
-    use nix::sys::stat::Mode;
-
     let cfgdir = buildcfg::CONFIGDIR;
 
     match nix::unistd::mkdir(cfgdir, Mode::from_bits_truncate(0o700)) {
@@ -77,3 +81,118 @@ pub fn create_configdir() -> Result<(), Error> {
             )
         })
 }
+
+/// Update self signed node certificate.
+pub fn update_self_signed_cert(force: bool) -> Result<(), Error> {
+
+    let backup_user = crate::backup::backup_user()?;
+
+    create_configdir()?;
+
+    let key_path = PathBuf::from(configdir!("/proxy.key"));
+    let cert_path = PathBuf::from(configdir!("/proxy.pem"));
+
+    if key_path.exists() && cert_path.exists() && !force { return Ok(()); }
+
+    let rsa = Rsa::generate(4096).unwrap();
+
+    let priv_pem = rsa.private_key_to_pem()?;
+
+    replace_file(
+        &key_path,
+        &priv_pem,
+        CreateOptions::new()
+            .perm(Mode::from_bits_truncate(0o0640))
+            .owner(nix::unistd::ROOT)
+            .group(backup_user.gid),
+    )?;
+
+    let mut x509 = X509Builder::new()?;
+
+    x509.set_version(2)?;
+
+    let today = openssl::asn1::Asn1Time::days_from_now(0)?;
+    x509.set_not_before(&today)?;
+    let expire = openssl::asn1::Asn1Time::days_from_now(365*1000)?;
+    x509.set_not_after(&expire)?;
+
+    let nodename = proxmox::tools::nodename();
+    let mut fqdn = nodename.to_owned();
+
+    let resolv_conf = crate::api2::node::dns::read_etc_resolv_conf()?;
+    if let Some(search) = resolv_conf["search"].as_str() {
+        fqdn.push('.');
+        fqdn.push_str(search);
+    }
+
+    // we try to generate an unique 'subject' to avoid browser problems
+    //(reused serial numbers, ..)
+    let uuid = proxmox::tools::uuid::Uuid::generate();
+
+    let mut subject_name = openssl::x509::X509NameBuilder::new()?;
+    subject_name.append_entry_by_text("O", "Proxmox Backup Server")?;
+    subject_name.append_entry_by_text("OU", &format!("{:X}", uuid))?;
+    subject_name.append_entry_by_text("CN", &fqdn)?;
+    let subject_name = subject_name.build();
+
+    x509.set_subject_name(&subject_name)?;
+    x509.set_issuer_name(&subject_name)?;
+
+    let bc = openssl::x509::extension::BasicConstraints::new(); // CA = false
+    let bc = bc.build()?;
+    x509.append_extension(bc)?;
+
+    let usage = openssl::x509::extension::ExtendedKeyUsage::new()
+        .server_auth()
+        .build()?;
+    x509.append_extension(usage)?;
+
+    let context = x509.x509v3_context(None, None);
+
+    let mut alt_names = openssl::x509::extension::SubjectAlternativeName::new();
+
+    alt_names.ip("127.0.0.1");
+    alt_names.ip("::1");
+
+    alt_names.dns("localhost");
+
+    if nodename != "localhost" { alt_names.dns(nodename); }
+    if nodename != fqdn { alt_names.dns(&fqdn); }
+
+    let alt_names = alt_names.build(&context)?;
+
+    x509.append_extension(alt_names)?;
+
+    let pub_pem = rsa.public_key_to_pem()?;
+    let pubkey = PKey::public_key_from_pem(&pub_pem)?;
+
+    x509.set_pubkey(&pubkey)?;
+
+    let context = x509.x509v3_context(None, None);
+    let ext = openssl::x509::extension::SubjectKeyIdentifier::new().build(&context)?;
+    x509.append_extension(ext)?;
+
+    let context = x509.x509v3_context(None, None);
+    let ext = openssl::x509::extension::AuthorityKeyIdentifier::new()
+        .keyid(true)
+        .build(&context)?;
+    x509.append_extension(ext)?;
+
+    let privkey = PKey::from_rsa(rsa)?;
+
+    x509.sign(&privkey, openssl::hash::MessageDigest::sha256())?;
+
+    let x509 = x509.build();
+    let cert_pem = x509.to_pem()?;
+
+    replace_file(
+        &cert_path,
+        &cert_pem,
+        CreateOptions::new()
+            .perm(Mode::from_bits_truncate(0o0640))
+            .owner(nix::unistd::ROOT)
+            .group(backup_user.gid),
+    )?;
+
+    Ok(())
+}