src/config.rs

   1 //! Proxmox Backup Server Configuration library
   2 //!
   3 //! This library contains helper to read, parse and write the
   4 //! configuration files.
   5
   6 use failure::*;
   7 use std::path::PathBuf;
   8 use nix::sys::stat::Mode;
   9 use openssl::rsa::{Rsa};
  10 use openssl::x509::{X509Builder};
  11 use openssl::pkey::PKey;
  12
  13 use proxmox::tools::fs::{CreateOptions, replace_file};
  14 use proxmox::tools::try_block;
  15
  16 use crate::buildcfg;
  17
  18 pub mod datastore;
  19 pub mod remotes;
  20
  21 /// Check configuration directory permissions
  22 ///
  23 /// For security reasons, we want to make sure they are set correctly:
  24 /// * owned by 'backup' user/group
  25 /// * nobody else can read (mode 0700)
  26 pub fn check_configdir_permissions() -> Result<(), Error> {
  27     let cfgdir = buildcfg::CONFIGDIR;
  28
  29     let backup_user = crate::backup::backup_user()?;
  30     let backup_uid = backup_user.uid.as_raw();
  31     let backup_gid = backup_user.gid.as_raw();
  32
  33     try_block!({
  34         let stat = nix::sys::stat::stat(cfgdir)?;
  35
  36         if stat.st_uid != backup_uid {
  37             bail!("wrong user ({} != {})", stat.st_uid, backup_uid);
  38         }
  39         if stat.st_gid != backup_gid {
  40             bail!("wrong group ({} != {})", stat.st_gid, backup_gid);
  41         }
  42
  43         let perm = stat.st_mode & 0o777;
  44         if perm != 0o700 {
  45             bail!("wrong permission ({:o} != {:o})", perm, 0o700);
  46         }
  47         Ok(())
  48     })
  49     .map_err(|err| {
  50         format_err!(
  51             "configuration directory '{}' permission problem - {}",
  52             cfgdir,
  53             err
  54         )
  55     })
  56 }
  57
  58 pub fn create_configdir() -> Result<(), Error> {
  59     let cfgdir = buildcfg::CONFIGDIR;
  60
  61     match nix::unistd::mkdir(cfgdir, Mode::from_bits_truncate(0o700)) {
  62         Ok(()) => {}
  63         Err(nix::Error::Sys(nix::errno::Errno::EEXIST)) => {
  64             check_configdir_permissions()?;
  65             return Ok(());
  66         }
  67         Err(err) => bail!(
  68             "unable to create configuration directory '{}' - {}",
  69             cfgdir,
  70             err
  71         ),
  72     }
  73
  74     let backup_user = crate::backup::backup_user()?;
  75
  76     nix::unistd::chown(cfgdir, Some(backup_user.uid), Some(backup_user.gid))
  77         .map_err(|err| {
  78             format_err!(
  79                 "unable to set configuration directory '{}' permissions - {}",
  80                 cfgdir,
  81                 err
  82             )
  83         })
  84 }
  85
  86 /// Update self signed node certificate.
  87 pub fn update_self_signed_cert(force: bool) -> Result<(), Error> {
  88
  89     let backup_user = crate::backup::backup_user()?;
  90
  91     create_configdir()?;
  92
  93     let key_path = PathBuf::from(configdir!("/proxy.key"));
  94     let cert_path = PathBuf::from(configdir!("/proxy.pem"));
  95
  96     if key_path.exists() && cert_path.exists() && !force { return Ok(()); }
  97
  98     let rsa = Rsa::generate(4096).unwrap();
  99
 100     let priv_pem = rsa.private_key_to_pem()?;
 101
 102     replace_file(
 103         &key_path,
 104         &priv_pem,
 105         CreateOptions::new()
 106             .perm(Mode::from_bits_truncate(0o0640))
 107             .owner(nix::unistd::ROOT)
 108             .group(backup_user.gid),
 109     )?;
 110
 111     let mut x509 = X509Builder::new()?;
 112
 113     x509.set_version(2)?;
 114
 115     let today = openssl::asn1::Asn1Time::days_from_now(0)?;
 116     x509.set_not_before(&today)?;
 117     let expire = openssl::asn1::Asn1Time::days_from_now(365*1000)?;
 118     x509.set_not_after(&expire)?;
 119
 120     let nodename = proxmox::tools::nodename();
 121     let mut fqdn = nodename.to_owned();
 122
 123     let resolv_conf = crate::api2::node::dns::read_etc_resolv_conf()?;
 124     if let Some(search) = resolv_conf["search"].as_str() {
 125         fqdn.push('.');
 126         fqdn.push_str(search);
 127     }
 128
 129     // we try to generate an unique 'subject' to avoid browser problems
 130     //(reused serial numbers, ..)
 131     let uuid = proxmox::tools::uuid::Uuid::generate();
 132
 133     let mut subject_name = openssl::x509::X509NameBuilder::new()?;
 134     subject_name.append_entry_by_text("O", "Proxmox Backup Server")?;
 135     subject_name.append_entry_by_text("OU", &format!("{:X}", uuid))?;
 136     subject_name.append_entry_by_text("CN", &fqdn)?;
 137     let subject_name = subject_name.build();
 138
 139     x509.set_subject_name(&subject_name)?;
 140     x509.set_issuer_name(&subject_name)?;
 141
 142     let bc = openssl::x509::extension::BasicConstraints::new(); // CA = false
 143     let bc = bc.build()?;
 144     x509.append_extension(bc)?;
 145
 146     let usage = openssl::x509::extension::ExtendedKeyUsage::new()
 147         .server_auth()
 148         .build()?;
 149     x509.append_extension(usage)?;
 150
 151     let context = x509.x509v3_context(None, None);
 152
 153     let mut alt_names = openssl::x509::extension::SubjectAlternativeName::new();
 154
 155     alt_names.ip("127.0.0.1");
 156     alt_names.ip("::1");
 157
 158     alt_names.dns("localhost");
 159
 160     if nodename != "localhost" { alt_names.dns(nodename); }
 161     if nodename != fqdn { alt_names.dns(&fqdn); }
 162
 163     let alt_names = alt_names.build(&context)?;
 164
 165     x509.append_extension(alt_names)?;
 166
 167     let pub_pem = rsa.public_key_to_pem()?;
 168     let pubkey = PKey::public_key_from_pem(&pub_pem)?;
 169
 170     x509.set_pubkey(&pubkey)?;
 171
 172     let context = x509.x509v3_context(None, None);
 173     let ext = openssl::x509::extension::SubjectKeyIdentifier::new().build(&context)?;
 174     x509.append_extension(ext)?;
 175
 176     let context = x509.x509v3_context(None, None);
 177     let ext = openssl::x509::extension::AuthorityKeyIdentifier::new()
 178         .keyid(true)
 179         .build(&context)?;
 180     x509.append_extension(ext)?;
 181
 182     let privkey = PKey::from_rsa(rsa)?;
 183
 184     x509.sign(&privkey, openssl::hash::MessageDigest::sha256())?;
 185
 186     let x509 = x509.build();
 187     let cert_pem = x509.to_pem()?;
 188
 189     replace_file(
 190         &cert_path,
 191         &cert_pem,
 192         CreateOptions::new()
 193             .perm(Mode::from_bits_truncate(0o0640))
 194             .owner(nix::unistd::ROOT)
 195             .group(backup_user.gid),
 196     )?;
 197
 198     Ok(())
 199 }