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use git_sec::{permission::Resource, Access, Trust};
use crate::permission;
/// Permissions associated with various resources of a git repository
#[derive(Debug, Clone)]
pub struct Permissions {
/// Control how a git-dir can be used.
///
/// Note that a repository won't be usable at all unless read and write permissions are given.
pub git_dir: Access<Resource, git_sec::ReadWrite>,
/// Permissions related to the environment
pub env: Environment,
/// Permissions related to the handling of git configuration.
pub config: Config,
}
/// Configure security relevant options when loading a git configuration.
#[derive(Copy, Clone, Ord, PartialOrd, PartialEq, Eq, Debug, Hash)]
pub struct Config {
/// Whether to use the system configuration.
/// This is defined as `$(prefix)/etc/gitconfig` on unix.
pub system: bool,
/// Whether to use the git application configuration.
///
/// A platform defined location for where a user's git application configuration should be located.
/// If `$XDG_CONFIG_HOME` is not set or empty, `$HOME/.config/git/config` will be used
/// on unix.
pub git: bool,
/// Whether to use the user configuration.
/// This is usually `~/.gitconfig` on unix.
pub user: bool,
/// Whether to use worktree configuration from `config.worktree`.
// TODO: figure out how this really applies and provide more information here.
// pub worktree: bool,
/// Whether to use the configuration from environment variables.
pub env: bool,
/// Whether to follow include files are encountered in loaded configuration,
/// via `include` and `includeIf` sections.
///
/// Note that this needs access to `GIT_*` prefixed environment variables.
pub includes: bool,
}
impl Config {
/// Allow everything which usually relates to a fully trusted environment
pub fn all() -> Self {
Config {
system: true,
git: true,
user: true,
env: true,
includes: true,
}
}
}
impl Default for Config {
fn default() -> Self {
Self::all()
}
}
/// Permissions related to the usage of environment variables
#[derive(Debug, Clone)]
pub struct Environment {
/// Control whether resources pointed to by `XDG_CONFIG_HOME` can be used when looking up common configuration values.
///
/// Note that [`git_sec::Permission::Forbid`] will cause the operation to abort if a resource is set via the XDG config environment.
pub xdg_config_home: permission::env_var::Resource,
/// Control the way resources pointed to by the home directory (similar to `xdg_config_home`) may be used.
pub home: permission::env_var::Resource,
/// Control if resources pointed to by `GIT_*` prefixed environment variables can be used.
pub git_prefix: permission::env_var::Resource,
}
impl Environment {
/// Allow access to the entire environment.
pub fn all() -> Self {
Environment {
xdg_config_home: Access::resource(git_sec::Permission::Allow),
home: Access::resource(git_sec::Permission::Allow),
git_prefix: Access::resource(git_sec::Permission::Allow),
}
}
}
impl Permissions {
/// Return permissions similar to what git does when the repository isn't owned by the current user,
/// thus refusing all operations in it.
pub fn strict() -> Self {
Permissions {
git_dir: Access::resource(git_sec::ReadWrite::READ),
env: Environment::all(),
config: Config::all(),
}
}
/// Return permissions that will not include configuration files not owned by the current user,
/// but trust system and global configuration files along with those which are owned by the current user.
///
/// This allows to read and write repositories even if they aren't owned by the current user, but avoid using
/// anything else that could cause us to write into unknown locations or use programs beyond our `PATH`.
pub fn secure() -> Self {
Permissions {
git_dir: Access::resource(git_sec::ReadWrite::all()),
env: Environment::all(),
config: Config::all(),
}
}
/// Everything is allowed with this set of permissions, thus we read all configuration and do what git typically
/// does with owned repositories.
pub fn all() -> Self {
Permissions {
git_dir: Access::resource(git_sec::ReadWrite::all()),
env: Environment::all(),
config: Config::all(),
}
}
}
impl git_sec::trust::DefaultForLevel for Permissions {
fn default_for_level(level: Trust) -> Self {
match level {
Trust::Full => Permissions::all(),
Trust::Reduced => Permissions::secure(),
}
}
}
impl Default for Permissions {
fn default() -> Self {
Permissions::secure()
}
}