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use std::env;
use std::path::{Path, PathBuf};
/// The OpenSSL environment variable to configure what certificate file to use.
pub const ENV_CERT_FILE: &'static str = "SSL_CERT_FILE";
/// The OpenSSL environment variable to configure what certificates directory to use.
pub const ENV_CERT_DIR: &'static str = "SSL_CERT_DIR";
pub struct ProbeResult {
pub cert_file: Option<PathBuf>,
pub cert_dir: Option<PathBuf>,
}
/// Probe the system for the directory in which CA certificates should likely be
/// found.
///
/// This will only search known system locations.
pub fn find_certs_dirs() -> Vec<PathBuf> {
cert_dirs_iter().map(Path::to_path_buf).collect()
}
// TODO: when we bump to 0.2, make this the `find_certs_dirs` function
fn cert_dirs_iter() -> impl Iterator<Item = &'static Path> {
// see http://gagravarr.org/writing/openssl-certs/others.shtml
[
"/var/ssl",
"/usr/share/ssl",
"/usr/local/ssl",
"/usr/local/openssl",
"/usr/local/etc/openssl",
"/usr/local/share",
"/usr/lib/ssl",
"/usr/ssl",
"/etc/openssl",
"/etc/pki/ca-trust/extracted/pem",
"/etc/pki/tls",
"/etc/ssl",
"/etc/certs",
"/opt/etc/ssl", // Entware
"/data/data/com.termux/files/usr/etc/tls",
"/boot/system/data/ssl",
]
.iter().map(Path::new).filter(|p| p.exists())
}
/// Probe for SSL certificates on the system, then configure the SSL certificate `SSL_CERT_FILE`
/// and `SSL_CERT_DIR` environment variables in this process for OpenSSL to use.
///
/// Preconfigured values in the environment variables will not be overwritten if the paths they
/// point to exist and are accessible.
pub fn init_ssl_cert_env_vars() {
try_init_ssl_cert_env_vars();
}
/// Probe for SSL certificates on the system, then configure the SSL certificate `SSL_CERT_FILE`
/// and `SSL_CERT_DIR` environment variables in this process for OpenSSL to use.
///
/// Preconfigured values in the environment variables will not be overwritten if the paths they
/// point to exist and are accessible.
///
/// Returns `true` if any certificate file or directory was found while probing.
/// Combine this with `has_ssl_cert_env_vars()` to check whether previously configured environment
/// variables are valid.
pub fn try_init_ssl_cert_env_vars() -> bool {
let ProbeResult { cert_file, cert_dir } = probe();
// we won't be overwriting existing env variables because if they're valid probe() will have
// returned them unchanged
if let Some(path) = &cert_file {
env::set_var(ENV_CERT_FILE, path);
}
if let Some(path) = &cert_dir {
env::set_var(ENV_CERT_DIR, path);
}
cert_file.is_some() || cert_dir.is_some()
}
/// Check whether the OpenSSL `SSL_CERT_FILE` and/or `SSL_CERT_DIR` environment variable is
/// configured in this process with an existing file or directory.
///
/// That being the case would indicate that certificates will be found successfully by OpenSSL.
///
/// Returns `true` if either variable is set to an existing file or directory.
pub fn has_ssl_cert_env_vars() -> bool {
let probe = probe_from_env();
probe.cert_file.is_some() || probe.cert_dir.is_some()
}
fn probe_from_env() -> ProbeResult {
let var = |name| {
env::var_os(name)
.map(PathBuf::from)
.filter(|p| p.exists())
};
ProbeResult {
cert_file: var(ENV_CERT_FILE),
cert_dir: var(ENV_CERT_DIR),
}
}
pub fn probe() -> ProbeResult {
let mut result = probe_from_env();
for certs_dir in cert_dirs_iter() {
// cert.pem looks to be an openssl 1.0.1 thing, while
// certs/ca-certificates.crt appears to be a 0.9.8 thing
let cert_filenames = [
"cert.pem",
"certs.pem",
"ca-bundle.pem",
"cacert.pem",
"ca-certificates.crt",
"certs/ca-certificates.crt",
"certs/ca-root-nss.crt",
"certs/ca-bundle.crt",
"CARootCertificates.pem",
"tls-ca-bundle.pem",
];
if result.cert_file.is_none() {
result.cert_file = cert_filenames
.iter()
.map(|fname| certs_dir.join(fname))
.find(|p| p.exists());
}
if result.cert_dir.is_none() {
let cert_dir = certs_dir.join("certs");
if cert_dir.exists() {
result.cert_dir = Some(cert_dir);
}
}
if result.cert_file.is_some() && result.cert_dir.is_some() {
break;
}
}
result
}