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