add acl config

This commit is contained in:
Dietmar Maurer 2020-04-11 12:24:26 +02:00
parent 9abcae1b0e
commit 5c6cdf9815
2 changed files with 313 additions and 0 deletions

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@ -18,6 +18,7 @@ use crate::buildcfg;
pub mod datastore;
pub mod remote;
pub mod user;
pub mod acl;
/// Check configuration directory permissions
///

312
src/config/acl.rs Normal file
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@ -0,0 +1,312 @@
use std::io::Write;
use std::collections::{HashMap, HashSet};
use std::path::{PathBuf, Path};
use failure::*;
use lazy_static::lazy_static;
use proxmox::tools::{fs::replace_file, fs::CreateOptions};
// define Privilege bitfield
pub const PRIV_SYS_AUDIT: u64 = 1 << 0;
pub const PRIV_SYS_MODIFY: u64 = 1 << 1;
pub const PRIV_SYS_POWER_MANAGEMENT: u64 = 1 << 2;
pub const PRIV_STORE_AUDIT: u64 = 1 << 3;
pub const PRIV_STORE_ALLOCATE: u64 = 1 << 4;
pub const PRIV_STORE_ALLOCATE_SPACE: u64 = 1 << 5;
pub const ROLE_AUDIT: u64 =
PRIV_SYS_AUDIT |
PRIV_STORE_AUDIT;
pub const ROLE_STORE_ADMIN: u64 =
PRIV_STORE_AUDIT |
PRIV_STORE_ALLOCATE |
PRIV_STORE_ALLOCATE_SPACE;
pub const ROLE_STORE_USER: u64 =
PRIV_STORE_AUDIT |
PRIV_STORE_ALLOCATE_SPACE;
lazy_static! {
static ref ROLE_NAMES: HashMap<&'static str, u64> = {
let mut map = HashMap::new();
map.insert("Admin", std::u64::MAX);
map.insert("Audit", ROLE_AUDIT);
map.insert("Store.Admin", ROLE_STORE_ADMIN);
map.insert("Store.User", ROLE_STORE_USER);
map
};
}
fn split_acl_path(path: &str) -> Vec<&str> {
let items = path.split('/');
let mut components = vec![];
for name in items {
if name.is_empty() { continue; }
components.push(name);
}
components
}
pub struct AclTree {
root: AclTreeNode,
}
struct AclTreeNode {
users: HashMap<String, HashMap<String, bool>>,
groups: HashMap<String, HashMap<String, bool>>,
children: HashMap<String, AclTreeNode>,
}
impl AclTreeNode {
pub fn new() -> Self {
Self {
users: HashMap::new(),
groups: HashMap::new(),
children: HashMap::new(),
}
}
pub fn insert_group_role(&mut self, group: String, role: String, propagate: bool) {
self.groups
.entry(group).or_insert_with(|| HashMap::new())
.insert(role, propagate);
}
pub fn insert_user_role(&mut self, user: String, role: String, propagate: bool) {
self.users
.entry(user).or_insert_with(|| HashMap::new())
.insert(role, propagate);
}
}
impl AclTree {
pub fn new() -> Self {
Self { root: AclTreeNode::new() }
}
fn get_or_insert_node(&mut self, path: &[&str]) -> &mut AclTreeNode {
let mut node = &mut self.root;
for comp in path {
node = node.children.entry(String::from(*comp))
.or_insert_with(|| AclTreeNode::new());
}
node
}
pub fn insert_group_role(&mut self, path: &str, group: &str, role: &str, propagate: bool) {
let path = split_acl_path(path);
let node = self.get_or_insert_node(&path);
node.insert_group_role(group.to_string(), role.to_string(), propagate);
}
pub fn insert_user_role(&mut self, path: &str, user: &str, role: &str, propagate: bool) {
let path = split_acl_path(path);
let node = self.get_or_insert_node(&path);
node.insert_user_role(user.to_string(), role.to_string(), propagate);
}
fn write_node_config(
node: &AclTreeNode,
path: &str,
w: &mut dyn Write,
) -> Result<(), Error> {
let mut role_ug_map0 = HashMap::new();
let mut role_ug_map1 = HashMap::new();
for (user, roles) in &node.users {
// no need to save, because root is always 'Administrator'
if user == "root@pam" { continue; }
for (role, propagate) in roles {
let role = role.as_str();
let user = user.to_string();
if *propagate {
role_ug_map1.entry(role).or_insert_with(|| HashSet::new())
.insert(user);
} else {
role_ug_map0.entry(role).or_insert_with(|| HashSet::new())
.insert(user);
}
}
}
for (group, roles) in &node.groups {
for (role, propagate) in roles {
let group = format!("@{}", group);
if *propagate {
role_ug_map1.entry(role).or_insert_with(|| HashSet::new())
.insert(group);
} else {
role_ug_map0.entry(role).or_insert_with(|| HashSet::new())
.insert(group);
}
}
}
fn group_by_property_list(
item_property_map: &HashMap<&str, HashSet<String>>,
) -> HashMap<String, HashSet<String>> {
let mut result_map = HashMap::new();
for (item, property_map) in item_property_map {
let mut item_list = property_map.iter().map(|v| v.as_str())
.collect::<Vec<&str>>();
item_list.sort();
let item_list = item_list.join(",");
result_map.entry(item_list).or_insert_with(|| HashSet::new())
.insert(item.to_string());
}
result_map
}
let mut uglist_role_map0 = group_by_property_list(&role_ug_map0)
.into_iter()
.collect::<Vec<(String, HashSet<String>)>>();
uglist_role_map0.sort_unstable_by(|a,b| a.0.cmp(&b.0));
let mut uglist_role_map1 = group_by_property_list(&role_ug_map1)
.into_iter()
.collect::<Vec<(String, HashSet<String>)>>();
uglist_role_map1.sort_unstable_by(|a,b| a.0.cmp(&b.0));
for (uglist, roles) in uglist_role_map0 {
let mut role_list = roles.iter().map(|v| v.as_str())
.collect::<Vec<&str>>();
role_list.sort();
writeln!(w, "acl:0:{}:{}:{}", path, uglist, role_list.join(","))?;
}
for (uglist, roles) in uglist_role_map1 {
let mut role_list = roles.iter().map(|v| v.as_str())
.collect::<Vec<&str>>();
role_list.sort();
writeln!(w, "acl:1:{}:{}:{}", path, uglist, role_list.join(","))?;
}
let mut child_names = node.children.keys().map(|v| v.as_str()).collect::<Vec<&str>>();
child_names.sort();
for name in child_names {
let child = node.children.get(name).unwrap();
let child_path = format!("{}/{}", path, name);
Self::write_node_config(child, &child_path, w)?;
}
Ok(())
}
pub fn write_config(&self, w: &mut dyn Write) -> Result<(), Error> {
Self::write_node_config(&self.root, "", w)
}
fn parse_acl_line(&mut self, line: &str) -> Result<(), Error> {
let items: Vec<&str> = line.split(':').collect();
if items.len() != 5 {
bail!("wrong number of items.");
}
if items[0] != "acl" {
bail!("line does not start with 'acl'.");
}
let propagate = if items[1] == "0" {
false
} else if items[1] == "1" {
true
} else {
bail!("expected '0' or '1' for propagate flag.");
};
let path = split_acl_path(items[2]);
let node = self.get_or_insert_node(&path);
let uglist: Vec<&str> = items[3].split(',').map(|v| v.trim()).collect();
let rolelist: Vec<&str> = items[4].split(',').map(|v| v.trim()).collect();
for user_or_group in &uglist {
for role in &rolelist {
if !ROLE_NAMES.contains_key(role) {
bail!("unknown role '{}'", role);
}
if user_or_group.starts_with('@') {
let group = &user_or_group[1..];
node.insert_group_role(group.to_string(), role.to_string(), propagate);
} else {
node.insert_user_role(user_or_group.to_string(), role.to_string(), propagate);
}
}
}
Ok(())
}
pub fn load(filename: &Path) -> Result<(Self, [u8;32]), Error> {
let mut tree = Self::new();
let raw = match std::fs::read_to_string(filename) {
Ok(v) => v,
Err(err) => {
if err.kind() == std::io::ErrorKind::NotFound {
String::new()
} else {
bail!("unable to read acl config {:?} - {}", filename, err);
}
}
};
let digest = openssl::sha::sha256(raw.as_bytes());
for (linenr, line) in raw.lines().enumerate() {
if let Err(err) = tree.parse_acl_line(line) {
bail!("unable to parse acl config {:?}, line {} - {}", filename, linenr, err);
}
}
Ok((tree, digest))
}
}
pub const ACL_CFG_FILENAME: &str = "/etc/proxmox-backup/acl.cfg";
pub const ACL_CFG_LOCKFILE: &str = "/etc/proxmox-backup/.acl.lck";
pub fn config() -> Result<(AclTree, [u8; 32]), Error> {
let path = PathBuf::from(ACL_CFG_FILENAME);
AclTree::load(&path)
}
pub fn store_config(acl: &AclTree, filename: &Path) -> Result<(), Error> {
let mut raw: Vec<u8> = Vec::new();
acl.write_config(&mut raw)?;
let backup_user = crate::backup::backup_user()?;
let mode = nix::sys::stat::Mode::from_bits_truncate(0o0640);
// set the correct owner/group/permissions while saving file
// owner(rw) = root, group(r)= backup
let options = CreateOptions::new()
.perm(mode)
.owner(nix::unistd::ROOT)
.group(backup_user.gid);
replace_file(filename, &raw, options)?;
Ok(())
}