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