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-rw-r--r--src/openvpn/options.c82
1 files changed, 61 insertions, 21 deletions
diff --git a/src/openvpn/options.c b/src/openvpn/options.c
index dcf60c6..bfcc6da 100644
--- a/src/openvpn/options.c
+++ b/src/openvpn/options.c
@@ -5,7 +5,7 @@
* packet encryption, packet authentication, and
* packet compression.
*
- * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
+ * Copyright (C) 2002-2013 OpenVPN Technologies, Inc. <sales@openvpn.net>
* Copyright (C) 2008-2013 David Sommerseth <dazo@users.sourceforge.net>
*
* This program is free software; you can redistribute it and/or modify
@@ -2603,6 +2603,44 @@ check_file_access(const int type, const char *file, const int mode, const char *
return (errcode != 0 ? true : false);
}
+/* A wrapper for check_file_access() which also takes a chroot directory.
+ * If chroot is NULL, behaviour is exactly the same as calling check_file_access() directly,
+ * otherwise it will look for the file inside the given chroot directory instead.
+ */
+static bool
+check_file_access_chroot(const char *chroot, const int type, const char *file, const int mode, const char *opt)
+{
+ bool ret = false;
+
+ /* If no file configured, no errors to look for */
+ if (!file)
+ return false;
+
+ /* If chroot is set, look for the file/directory inside the chroot */
+ if( chroot )
+ {
+ struct gc_arena gc = gc_new();
+ struct buffer chroot_file;
+ int len = 0;
+
+ /* Build up a new full path including chroot directory */
+ len = strlen(chroot) + strlen(PATH_SEPARATOR_STR) + strlen(file) + 1;
+ chroot_file = alloc_buf_gc(len, &gc);
+ buf_printf(&chroot_file, "%s%s%s", chroot, PATH_SEPARATOR_STR, file);
+ ASSERT (chroot_file.len > 0);
+
+ ret = check_file_access(type, BSTR(&chroot_file), mode, opt);
+ gc_free(&gc);
+ }
+ else
+ {
+ /* No chroot in play, just call core file check function */
+ ret = check_file_access(type, file, mode, opt);
+ }
+ return ret;
+}
+
+
/*
* Verifies that the path in the "command" that comes after certain script options (e.g., --up) is a
* valid file with appropriate permissions.
@@ -2620,7 +2658,7 @@ check_file_access(const int type, const char *file, const int mode, const char *
* check_file_access() arguments.
*/
static bool
-check_cmd_access(const char *command, const char *opt)
+check_cmd_access(const char *command, const char *opt, const char *chroot)
{
struct argv argv;
bool return_code;
@@ -2639,7 +2677,7 @@ check_cmd_access(const char *command, const char *opt)
* only requires X_OK to function on Unix - a scenario not unlikely to
* be seen on suid binaries.
*/
- return_code = check_file_access(CHKACC_FILE, argv.argv[0], X_OK, opt);
+ return_code = check_file_access_chroot(chroot, CHKACC_FILE, argv.argv[0], X_OK, opt);
else
{
msg (M_NOPREFIX|M_OPTERR, "%s fails with '%s': No path to executable.",
@@ -2665,7 +2703,7 @@ options_postprocess_filechecks (struct options *options)
#ifdef ENABLE_SSL
errs |= check_file_access (CHKACC_FILE|CHKACC_INLINE, options->dh_file, R_OK, "--dh");
errs |= check_file_access (CHKACC_FILE|CHKACC_INLINE, options->ca_file, R_OK, "--ca");
- errs |= check_file_access (CHKACC_FILE, options->ca_path, R_OK, "--capath");
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->ca_path, R_OK, "--capath");
errs |= check_file_access (CHKACC_FILE|CHKACC_INLINE, options->cert_file, R_OK, "--cert");
errs |= check_file_access (CHKACC_FILE|CHKACC_INLINE, options->extra_certs_file, R_OK,
"--extra-certs");
@@ -2678,10 +2716,10 @@ options_postprocess_filechecks (struct options *options)
"--pkcs12");
if (options->ssl_flags & SSLF_CRL_VERIFY_DIR)
- errs |= check_file_access (CHKACC_FILE, options->crl_file, R_OK|X_OK,
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->crl_file, R_OK|X_OK,
"--crl-verify directory");
else
- errs |= check_file_access (CHKACC_FILE, options->crl_file, R_OK,
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->crl_file, R_OK,
"--crl-verify");
errs |= check_file_access (CHKACC_FILE|CHKACC_INLINE, options->tls_auth_file, R_OK,
@@ -2723,13 +2761,13 @@ options_postprocess_filechecks (struct options *options)
/* ** Config related ** */
#ifdef ENABLE_SSL
- errs |= check_file_access (CHKACC_FILE, options->tls_export_cert,
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->tls_export_cert,
R_OK|W_OK|X_OK, "--tls-export-cert");
#endif /* ENABLE_SSL */
#if P2MP_SERVER
- errs |= check_file_access (CHKACC_FILE, options->client_config_dir,
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->client_config_dir,
R_OK|X_OK, "--client-config-dir");
- errs |= check_file_access (CHKACC_FILE, options->tmp_dir,
+ errs |= check_file_access_chroot (options->chroot_dir, CHKACC_FILE, options->tmp_dir,
R_OK|W_OK|X_OK, "Temporary directory (--tmp-dir)");
#endif /* P2MP_SERVER */
@@ -3996,7 +4034,8 @@ static void
set_user_script (struct options *options,
const char **script,
const char *new_script,
- const char *type)
+ const char *type,
+ bool in_chroot)
{
if (*script) {
msg (M_WARN, "Multiple --%s scripts defined. "
@@ -4011,8 +4050,9 @@ set_user_script (struct options *options,
openvpn_snprintf (script_name, sizeof(script_name),
"--%s script", type);
- if (check_cmd_access (*script, script_name))
+ if (check_cmd_access (*script, script_name, (in_chroot ? options->chroot_dir : NULL)))
msg (M_USAGE, "Please correct this error.");
+
}
#endif
}
@@ -4530,7 +4570,7 @@ add_option (struct options *options,
set_user_script (options,
&options->ipchange,
string_substitute (p[1], ',', ' ', &options->gc),
- "ipchange");
+ "ipchange", true);
}
else if (streq (p[0], "float"))
{
@@ -4576,14 +4616,14 @@ add_option (struct options *options,
VERIFY_PERMISSION (OPT_P_SCRIPT);
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
- set_user_script (options, &options->up_script, p[1], "up");
+ set_user_script (options, &options->up_script, p[1], "up", false);
}
else if (streq (p[0], "down") && p[1])
{
VERIFY_PERMISSION (OPT_P_SCRIPT);
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
- set_user_script (options, &options->down_script, p[1], "down");
+ set_user_script (options, &options->down_script, p[1], "down", true);
}
else if (streq (p[0], "down-pre"))
{
@@ -5264,7 +5304,7 @@ add_option (struct options *options,
VERIFY_PERMISSION (OPT_P_SCRIPT);
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
- set_user_script (options, &options->route_script, p[1], "route-up");
+ set_user_script (options, &options->route_script, p[1], "route-up", false);
}
else if (streq (p[0], "route-pre-down") && p[1])
{
@@ -5274,7 +5314,7 @@ add_option (struct options *options,
set_user_script (options,
&options->route_predown_script,
p[1],
- "route-pre-down");
+ "route-pre-down", true);
}
else if (streq (p[0], "route-noexec"))
{
@@ -5643,7 +5683,7 @@ add_option (struct options *options,
}
set_user_script (options,
&options->auth_user_pass_verify_script,
- p[1], "auth-user-pass-verify");
+ p[1], "auth-user-pass-verify", true);
}
else if (streq (p[0], "client-connect") && p[1])
{
@@ -5651,7 +5691,7 @@ add_option (struct options *options,
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
set_user_script (options, &options->client_connect_script,
- p[1], "client-connect");
+ p[1], "client-connect", true);
}
else if (streq (p[0], "client-disconnect") && p[1])
{
@@ -5659,7 +5699,7 @@ add_option (struct options *options,
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
set_user_script (options, &options->client_disconnect_script,
- p[1], "client-disconnect");
+ p[1], "client-disconnect", true);
}
else if (streq (p[0], "learn-address") && p[1])
{
@@ -5667,7 +5707,7 @@ add_option (struct options *options,
if (!no_more_than_n_args (msglevel, p, 2, NM_QUOTE_HINT))
goto err;
set_user_script (options, &options->learn_address_script,
- p[1], "learn-address");
+ p[1], "learn-address", true);
}
else if (streq (p[0], "tmp-dir") && p[1])
{
@@ -6570,7 +6610,7 @@ add_option (struct options *options,
goto err;
set_user_script (options, &options->tls_verify,
string_substitute (p[1], ',', ' ', &options->gc),
- "tls-verify");
+ "tls-verify", true);
}
#ifndef ENABLE_CRYPTO_POLARSSL
else if (streq (p[0], "tls-export-cert") && p[1])
generated by cgit (git 2.34.1) at 2024-05-09 02:51:10 +0000