1 files changed, 155 insertions, 0 deletions
diff --git a/plugins/sudoers/sudoers_hooks.c b/plugins/sudoers/sudoers_hooks.c
new file mode 100644
index 0000000..738f93b
--- /dev/null
+++ b/plugins/sudoers/sudoers_hooks.c
@@ -0,0 +1,155 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2000-2005, 2007-2019
+ *	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.
+ *
+ * Sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F39502-99-1-0512.
+ */
+
+/*
+ * 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 <errno.h>
+
+#include "sudoers.h"
+
+/*
+ * Similar to setenv(3) but operates on a private copy of the environment.
+ * Does not include warnings or debugging to avoid recursive calls.
+ */
+static int
+sudo_setenv_nodebug(const char *var, const char *val, int overwrite)
+{
+    char *ep, *estring = NULL;
+    const char *cp;
+    size_t esize;
+    int ret = -1;
+
+    if (var == NULL || *var == '\0') {
+	errno = EINVAL;
+	goto done;
+    }
+
+    /*
+     * POSIX says a var name with '=' is an error but BSD
+     * just ignores the '=' and anything after it.
+     */
+    for (cp = var; *cp && *cp != '='; cp++)
+	continue;
+    esize = (size_t)(cp - var) + 2;
+    if (val) {
+	esize += strlen(val);	/* glibc treats a NULL val as "" */
+    }
+
+    /* Allocate and fill in estring. */
+    if ((estring = ep = malloc(esize)) == NULL)
+	goto done;
+    for (cp = var; *cp && *cp != '='; cp++)
+	*ep++ = *cp;
+    *ep++ = '=';
+    if (val) {
+	for (cp = val; *cp; cp++)
+	    *ep++ = *cp;
+    }
+    *ep = '\0';
+
+    ret = sudo_putenv_nodebug(estring, true, overwrite);
+done:
+    if (ret == -1)
+	free(estring);
+    else
+	sudoers_gc_add(GC_PTR, estring);
+    return ret;
+}
+
+int
+sudoers_hook_getenv(const char *name, char **value, void *closure)
+{
+    static bool in_progress = false; /* avoid recursion */
+
+    if (in_progress || env_get() == NULL)
+	return SUDO_HOOK_RET_NEXT;
+
+    in_progress = true;
+
+    /* Hack to make GNU gettext() find the sudoers locale when needed. */
+    if (*name == 'L' && sudoers_getlocale() == SUDOERS_LOCALE_SUDOERS) {
+	if (strcmp(name, "LANGUAGE") == 0 || strcmp(name, "LANG") == 0) {
+	    *value = NULL;
+	    goto done;
+	}
+	if (strcmp(name, "LC_ALL") == 0 || strcmp(name, "LC_MESSAGES") == 0) {
+	    *value = (char *)def_sudoers_locale;
+	    goto done;
+	}
+    }
+
+    *value = sudo_getenv_nodebug(name);
+done:
+    in_progress = false;
+    return SUDO_HOOK_RET_STOP;
+}
+
+int
+sudoers_hook_putenv(char *string, void *closure)
+{
+    static bool in_progress = false; /* avoid recursion */
+
+    if (in_progress || env_get() == NULL)
+	return SUDO_HOOK_RET_NEXT;
+
+    in_progress = true;
+    sudo_putenv_nodebug(string, true, true);
+    in_progress = false;
+    return SUDO_HOOK_RET_STOP;
+}
+
+int
+sudoers_hook_setenv(const char *name, const char *value, int overwrite, void *closure)
+{
+    static bool in_progress = false; /* avoid recursion */
+
+    if (in_progress || env_get() == NULL)
+	return SUDO_HOOK_RET_NEXT;
+
+    in_progress = true;
+    sudo_setenv_nodebug(name, value, overwrite);
+    in_progress = false;
+    return SUDO_HOOK_RET_STOP;
+}
+
+int
+sudoers_hook_unsetenv(const char *name, void *closure)
+{
+    static bool in_progress = false; /* avoid recursion */
+
+    if (in_progress || env_get() == NULL)
+	return SUDO_HOOK_RET_NEXT;
+
+    in_progress = true;
+    sudo_unsetenv_nodebug(name);
+    in_progress = false;
+    return SUDO_HOOK_RET_STOP;
+}