Move check_user_* functions to check_util.c so testsudoers can use them.

plugins/sudoers/check_util.c

@@ -0,0 +1,115 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2019-2020, 2023 Todd C. Miller <Todd.Miller@sudo.ws>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This is an open source non-commercial project. Dear PVS-Studio, please check it.
+ * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
+ */
+
+#include <config.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <pwd.h>
+
+#include "sudoers.h"
+
+/*
+ * Returns true if the specified shell is allowed by /etc/shells, else false.
+ */
+bool
+check_user_shell(const struct passwd *pw)
+{
+    const char *shell;
+    debug_decl(check_user_shell, SUDOERS_DEBUG_AUTH);
+
+    if (!def_runas_check_shell)
+	debug_return_bool(true);
+
+    sudo_debug_printf(SUDO_DEBUG_INFO,
+	"%s: checking /etc/shells for %s", __func__, pw->pw_shell);
+
+    setusershell();
+    while ((shell = getusershell()) != NULL) {
+	if (strcmp(shell, pw->pw_shell) == 0)
+	    debug_return_bool(true);
+    }
+    endusershell();
+
+    debug_return_bool(false);
+}
+
+/*
+ * Check whether user_runchroot matches def_runchroot.
+ * Returns true if matched, false if not matched and -1 on error.
+ */
+int
+check_user_runchroot(void)
+{
+    debug_decl(check_user_runchroot, SUDOERS_DEBUG_AUTH);
+
+    if (user_runchroot == NULL)
+	debug_return_bool(true);
+
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+	"def_runchroot %s, user_runchroot %s",
+	def_runchroot ? def_runchroot : "none",
+	user_runchroot ? user_runchroot : "none");
+
+    if (def_runchroot == NULL || (strcmp(def_runchroot, "*") != 0 &&
+	    strcmp(def_runchroot, user_runchroot) != 0)) {
+	debug_return_bool(false);
+    }
+    free(def_runchroot);
+    if ((def_runchroot = strdup(user_runchroot)) == NULL) {
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	debug_return_int(-1);
+    }
+    debug_return_bool(true);
+}
+
+/*
+ * Check whether user_runcwd matches def_runcwd.
+ * Returns true if matched, false if not matched and -1 on error.
+ */
+int
+check_user_runcwd(void)
+{
+    debug_decl(check_user_runcwd, SUDOERS_DEBUG_AUTH);
+
+    if (user_runcwd == NULL)
+	debug_return_bool(true);
+
+    sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
+        "def_runcwd %s, user_runcwd %s",
+        def_runcwd ? def_runcwd : "none",
+        user_runcwd ? user_runcwd : "none");
+
+    if (def_runcwd == NULL || (strcmp(def_runcwd, "*") != 0 &&
+            strcmp(def_runcwd, user_runcwd) != 0)) {
+        debug_return_bool(false);
+    }
+    free(def_runcwd);
+    if ((def_runcwd = strdup(user_runcwd)) == NULL) {
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	debug_return_int(-1);
+    }
+    debug_return_bool(true);
+}