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 anyhow::{bail, format_err, Error};
   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::try_block;
  15
  16 use crate::buildcfg;
  17
  18 pub mod datastore;
  19 pub mod remote;
  20 pub mod user;
  21 pub mod acl;
  22 pub mod cached_user_info;
  23 pub mod network;
  24
  25 /// Check configuration directory permissions
  26 ///
  27 /// For security reasons, we want to make sure they are set correctly:
  28 /// * owned by 'backup' user/group
  29 /// * nobody else can read (mode 0700)
  30 pub fn check_configdir_permissions() -> Result<(), Error> {
  31     let cfgdir = buildcfg::CONFIGDIR;
  32
  33     let backup_user = crate::backup::backup_user()?;
  34     let backup_uid = backup_user.uid.as_raw();
  35     let backup_gid = backup_user.gid.as_raw();
  36
  37     try_block!({
  38         let stat = nix::sys::stat::stat(cfgdir)?;
  39
  40         if stat.st_uid != backup_uid {
  41             bail!("wrong user ({} != {})", stat.st_uid, backup_uid);
  42         }
  43         if stat.st_gid != backup_gid {
  44             bail!("wrong group ({} != {})", stat.st_gid, backup_gid);
  45         }
  46
  47         let perm = stat.st_mode & 0o777;
  48         if perm != 0o700 {
  49             bail!("wrong permission ({:o} != {:o})", perm, 0o700);
  50         }
  51         Ok(())
  52     })
  53     .map_err(|err| {
  54         format_err!(
  55             "configuration directory '{}' permission problem - {}",
  56             cfgdir,
  57             err
  58         )
  59     })
  60 }
  61
  62 pub fn create_configdir() -> Result<(), Error> {
  63     let cfgdir = buildcfg::CONFIGDIR;
  64
  65     match nix::unistd::mkdir(cfgdir, Mode::from_bits_truncate(0o700)) {
  66         Ok(()) => {}
  67         Err(nix::Error::Sys(nix::errno::Errno::EEXIST)) => {
  68             check_configdir_permissions()?;
  69             return Ok(());
  70         }
  71         Err(err) => bail!(
  72             "unable to create configuration directory '{}' - {}",
  73             cfgdir,
  74             err
  75         ),
  76     }
  77
  78     let backup_user = crate::backup::backup_user()?;
  79
  80     nix::unistd::chown(cfgdir, Some(backup_user.uid), Some(backup_user.gid))
  81         .map_err(|err| {
  82             format_err!(
  83                 "unable to set configuration directory '{}' permissions - {}",
  84                 cfgdir,
  85                 err
  86             )
  87         })
  88 }
  89
  90 /// Update self signed node certificate.
  91 pub fn update_self_signed_cert(force: bool) -> Result<(), Error> {
  92
  93     let backup_user = crate::backup::backup_user()?;
  94
  95     create_configdir()?;
  96
  97     let key_path = PathBuf::from(configdir!("/proxy.key"));
  98     let cert_path = PathBuf::from(configdir!("/proxy.pem"));
  99
 100     if key_path.exists() && cert_path.exists() && !force { return Ok(()); }
 101
 102     let rsa = Rsa::generate(4096).unwrap();
 103
 104     let priv_pem = rsa.private_key_to_pem()?;
 105
 106     replace_file(
 107         &key_path,
 108         &priv_pem,
 109         CreateOptions::new()
 110             .perm(Mode::from_bits_truncate(0o0640))
 111             .owner(nix::unistd::ROOT)
 112             .group(backup_user.gid),
 113     )?;
 114
 115     let mut x509 = X509Builder::new()?;
 116
 117     x509.set_version(2)?;
 118
 119     let today = openssl::asn1::Asn1Time::days_from_now(0)?;
 120     x509.set_not_before(&today)?;
 121     let expire = openssl::asn1::Asn1Time::days_from_now(365*1000)?;
 122     x509.set_not_after(&expire)?;
 123
 124     let nodename = proxmox::tools::nodename();
 125     let mut fqdn = nodename.to_owned();
 126
 127     let resolv_conf = crate::api2::node::dns::read_etc_resolv_conf()?;
 128     if let Some(search) = resolv_conf["search"].as_str() {
 129         fqdn.push('.');
 130         fqdn.push_str(search);
 131     }
 132
 133     // we try to generate an unique 'subject' to avoid browser problems
 134     //(reused serial numbers, ..)
 135     let uuid = proxmox::tools::uuid::Uuid::generate();
 136
 137     let mut subject_name = openssl::x509::X509NameBuilder::new()?;
 138     subject_name.append_entry_by_text("O", "Proxmox Backup Server")?;
 139     subject_name.append_entry_by_text("OU", &format!("{:X}", uuid))?;
 140     subject_name.append_entry_by_text("CN", &fqdn)?;
 141     let subject_name = subject_name.build();
 142
 143     x509.set_subject_name(&subject_name)?;
 144     x509.set_issuer_name(&subject_name)?;
 145
 146     let bc = openssl::x509::extension::BasicConstraints::new(); // CA = false
 147     let bc = bc.build()?;
 148     x509.append_extension(bc)?;
 149
 150     let usage = openssl::x509::extension::ExtendedKeyUsage::new()
 151         .server_auth()
 152         .build()?;
 153     x509.append_extension(usage)?;
 154
 155     let context = x509.x509v3_context(None, None);
 156
 157     let mut alt_names = openssl::x509::extension::SubjectAlternativeName::new();
 158
 159     alt_names.ip("127.0.0.1");
 160     alt_names.ip("::1");
 161
 162     alt_names.dns("localhost");
 163
 164     if nodename != "localhost" { alt_names.dns(nodename); }
 165     if nodename != fqdn { alt_names.dns(&fqdn); }
 166
 167     let alt_names = alt_names.build(&context)?;
 168
 169     x509.append_extension(alt_names)?;
 170
 171     let pub_pem = rsa.public_key_to_pem()?;
 172     let pubkey = PKey::public_key_from_pem(&pub_pem)?;
 173
 174     x509.set_pubkey(&pubkey)?;
 175
 176     let context = x509.x509v3_context(None, None);
 177     let ext = openssl::x509::extension::SubjectKeyIdentifier::new().build(&context)?;
 178     x509.append_extension(ext)?;
 179
 180     let context = x509.x509v3_context(None, None);
 181     let ext = openssl::x509::extension::AuthorityKeyIdentifier::new()
 182         .keyid(true)
 183         .build(&context)?;
 184     x509.append_extension(ext)?;
 185
 186     let privkey = PKey::from_rsa(rsa)?;
 187
 188     x509.sign(&privkey, openssl::hash::MessageDigest::sha256())?;
 189
 190     let x509 = x509.build();
 191     let cert_pem = x509.to_pem()?;
 192
 193     replace_file(
 194         &cert_path,
 195         &cert_pem,
 196         CreateOptions::new()
 197             .perm(Mode::from_bits_truncate(0o0640))
 198             .owner(nix::unistd::ROOT)
 199             .group(backup_user.gid),
 200     )?;
 201
 202     Ok(())
 203 }