1 files changed, 136 insertions, 0 deletions
diff --git a/vendor/openssl-probe/src/lib.rs b/vendor/openssl-probe/src/lib.rs
new file mode 100644
index 000000000..0db12a73f
--- /dev/null
+++ b/vendor/openssl-probe/src/lib.rs
@@ -0,0 +1,136 @@
+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
+}