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