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 acl;
  19 pub mod cached_user_info;
  20 pub mod datastore;
  21 pub mod network;
  22 pub mod remote;
  23 pub mod sync;
  24 pub mod token_shadow;
  25 pub mod user;
  26 pub mod verify;
  27
  28 /// Check configuration directory permissions
  29 ///
  30 /// For security reasons, we want to make sure they are set correctly:
  31 /// * owned by 'backup' user/group
  32 /// * nobody else can read (mode 0700)
  33 pub fn check_configdir_permissions() -> Result<(), Error> {
  34     let cfgdir = buildcfg::CONFIGDIR;
  35
  36     let backup_user = crate::backup::backup_user()?;
  37     let backup_uid = backup_user.uid.as_raw();
  38     let backup_gid = backup_user.gid.as_raw();
  39
  40     try_block!({
  41         let stat = nix::sys::stat::stat(cfgdir)?;
  42
  43         if stat.st_uid != backup_uid {
  44             bail!("wrong user ({} != {})", stat.st_uid, backup_uid);
  45         }
  46         if stat.st_gid != backup_gid {
  47             bail!("wrong group ({} != {})", stat.st_gid, backup_gid);
  48         }
  49
  50         let perm = stat.st_mode & 0o777;
  51         if perm != 0o700 {
  52             bail!("wrong permission ({:o} != {:o})", perm, 0o700);
  53         }
  54         Ok(())
  55     })
  56     .map_err(|err| {
  57         format_err!(
  58             "configuration directory '{}' permission problem - {}",
  59             cfgdir,
  60             err
  61         )
  62     })
  63 }
  64
  65 pub fn create_configdir() -> Result<(), Error> {
  66     let cfgdir = buildcfg::CONFIGDIR;
  67
  68     match nix::unistd::mkdir(cfgdir, Mode::from_bits_truncate(0o700)) {
  69         Ok(()) => {}
  70         Err(nix::Error::Sys(nix::errno::Errno::EEXIST)) => {
  71             check_configdir_permissions()?;
  72             return Ok(());
  73         }
  74         Err(err) => bail!(
  75             "unable to create configuration directory '{}' - {}",
  76             cfgdir,
  77             err
  78         ),
  79     }
  80
  81     let backup_user = crate::backup::backup_user()?;
  82
  83     nix::unistd::chown(cfgdir, Some(backup_user.uid), Some(backup_user.gid))
  84         .map_err(|err| {
  85             format_err!(
  86                 "unable to set configuration directory '{}' permissions - {}",
  87                 cfgdir,
  88                 err
  89             )
  90         })
  91 }
  92
  93 /// Update self signed node certificate.
  94 pub fn update_self_signed_cert(force: bool) -> Result<(), Error> {
  95
  96     let backup_user = crate::backup::backup_user()?;
  97
  98     create_configdir()?;
  99
 100     let key_path = PathBuf::from(configdir!("/proxy.key"));
 101     let cert_path = PathBuf::from(configdir!("/proxy.pem"));
 102
 103     if key_path.exists() && cert_path.exists() && !force { return Ok(()); }
 104
 105     let rsa = Rsa::generate(4096).unwrap();
 106
 107     let priv_pem = rsa.private_key_to_pem()?;
 108
 109     replace_file(
 110         &key_path,
 111         &priv_pem,
 112         CreateOptions::new()
 113             .perm(Mode::from_bits_truncate(0o0640))
 114             .owner(nix::unistd::ROOT)
 115             .group(backup_user.gid),
 116     )?;
 117
 118     let mut x509 = X509Builder::new()?;
 119
 120     x509.set_version(2)?;
 121
 122     let today = openssl::asn1::Asn1Time::days_from_now(0)?;
 123     x509.set_not_before(&today)?;
 124     let expire = openssl::asn1::Asn1Time::days_from_now(365*1000)?;
 125     x509.set_not_after(&expire)?;
 126
 127     let nodename = proxmox::tools::nodename();
 128     let mut fqdn = nodename.to_owned();
 129
 130     let resolv_conf = crate::api2::node::dns::read_etc_resolv_conf()?;
 131     if let Some(search) = resolv_conf["search"].as_str() {
 132         fqdn.push('.');
 133         fqdn.push_str(search);
 134     }
 135
 136     // we try to generate an unique 'subject' to avoid browser problems
 137     //(reused serial numbers, ..)
 138     let uuid = proxmox::tools::uuid::Uuid::generate();
 139
 140     let mut subject_name = openssl::x509::X509NameBuilder::new()?;
 141     subject_name.append_entry_by_text("O", "Proxmox Backup Server")?;
 142     subject_name.append_entry_by_text("OU", &format!("{:X}", uuid))?;
 143     subject_name.append_entry_by_text("CN", &fqdn)?;
 144     let subject_name = subject_name.build();
 145
 146     x509.set_subject_name(&subject_name)?;
 147     x509.set_issuer_name(&subject_name)?;
 148
 149     let bc = openssl::x509::extension::BasicConstraints::new(); // CA = false
 150     let bc = bc.build()?;
 151     x509.append_extension(bc)?;
 152
 153     let usage = openssl::x509::extension::ExtendedKeyUsage::new()
 154         .server_auth()
 155         .build()?;
 156     x509.append_extension(usage)?;
 157
 158     let context = x509.x509v3_context(None, None);
 159
 160     let mut alt_names = openssl::x509::extension::SubjectAlternativeName::new();
 161
 162     alt_names.ip("127.0.0.1");
 163     alt_names.ip("::1");
 164
 165     alt_names.dns("localhost");
 166
 167     if nodename != "localhost" { alt_names.dns(nodename); }
 168     if nodename != fqdn { alt_names.dns(&fqdn); }
 169
 170     let alt_names = alt_names.build(&context)?;
 171
 172     x509.append_extension(alt_names)?;
 173
 174     let pub_pem = rsa.public_key_to_pem()?;
 175     let pubkey = PKey::public_key_from_pem(&pub_pem)?;
 176
 177     x509.set_pubkey(&pubkey)?;
 178
 179     let context = x509.x509v3_context(None, None);
 180     let ext = openssl::x509::extension::SubjectKeyIdentifier::new().build(&context)?;
 181     x509.append_extension(ext)?;
 182
 183     let context = x509.x509v3_context(None, None);
 184     let ext = openssl::x509::extension::AuthorityKeyIdentifier::new()
 185         .keyid(true)
 186         .build(&context)?;
 187     x509.append_extension(ext)?;
 188
 189     let privkey = PKey::from_rsa(rsa)?;
 190
 191     x509.sign(&privkey, openssl::hash::MessageDigest::sha256())?;
 192
 193     let x509 = x509.build();
 194     let cert_pem = x509.to_pem()?;
 195
 196     replace_file(
 197         &cert_path,
 198         &cert_pem,
 199         CreateOptions::new()
 200             .perm(Mode::from_bits_truncate(0o0640))
 201             .owner(nix::unistd::ROOT)
 202             .group(backup_user.gid),
 203     )?;
 204
 205     Ok(())
 206 }