Adding upstream version 1.9.13p3.upstream/1.9.13p3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 776 insertions, 0 deletions

diff --git a/lib/util/sudo_conf.c b/lib/util/sudo_conf.c
new file mode 100644
index 0000000..9c56120
--- /dev/null
+++ b/lib/util/sudo_conf.c
@@ -0,0 +1,776 @@
+/*
+ * SPDX-License-Identifier: ISC
+ *
+ * Copyright (c) 2009-2021 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 <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif
+#include <string.h>
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#include <unistd.h>
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+
+#define SUDO_ERROR_WRAP	0
+
+#include "sudo_compat.h"
+#include "sudo_conf.h"
+#include "sudo_debug.h"
+#include "sudo_fatal.h"
+#include "sudo_gettext.h"
+#include "sudo_plugin.h"
+#include "sudo_util.h"
+#include "pathnames.h"
+
+#ifndef _PATH_SUDO_INTERCEPT
+# define _PATH_SUDO_INTERCEPT NULL
+#endif
+#ifndef _PATH_SUDO_NOEXEC
+# define _PATH_SUDO_NOEXEC NULL
+#endif
+
+struct sudo_conf_table {
+    const char *name;
+    unsigned int namelen;
+    int (*parser)(const char *entry, const char *conf_file, unsigned int lineno);
+};
+
+struct sudo_conf_path_table {
+    const char *pname;
+    unsigned int pnamelen;
+    bool dynamic;
+    const char *pval;
+};
+
+struct sudo_conf_settings {
+    bool updated;
+    bool disable_coredump;
+    bool probe_interfaces;
+    int group_source;
+    int max_groups;
+};
+
+static int parse_debug(const char *entry, const char *conf_file, unsigned int lineno);
+static int parse_path(const char *entry, const char *conf_file, unsigned int lineno);
+static int parse_plugin(const char *entry, const char *conf_file, unsigned int lineno);
+static int parse_variable(const char *entry, const char *conf_file, unsigned int lineno);
+
+static struct sudo_conf_table sudo_conf_table[] = {
+    { "Debug", sizeof("Debug") - 1, parse_debug },
+    { "Path", sizeof("Path") - 1, parse_path },
+    { "Plugin", sizeof("Plugin") - 1, parse_plugin },
+    { "Set", sizeof("Set") - 1, parse_variable },
+    { NULL }
+};
+
+static int set_var_disable_coredump(const char *entry, const char *conf_file, unsigned int);
+static int set_var_group_source(const char *entry, const char *conf_file, unsigned int);
+static int set_var_max_groups(const char *entry, const char *conf_file, unsigned int);
+static int set_var_probe_interfaces(const char *entry, const char *conf_file, unsigned int);
+
+static struct sudo_conf_table sudo_conf_var_table[] = {
+    { "disable_coredump", sizeof("disable_coredump") - 1, set_var_disable_coredump },
+    { "group_source", sizeof("group_source") - 1, set_var_group_source },
+    { "max_groups", sizeof("max_groups") - 1, set_var_max_groups },
+    { "probe_interfaces", sizeof("probe_interfaces") - 1, set_var_probe_interfaces },
+    { NULL }
+};
+
+/* Indexes into path_table[] below (order is important). */
+#define SUDO_CONF_PATH_ASKPASS		0
+#define SUDO_CONF_PATH_SESH		1
+#define SUDO_CONF_PATH_INTERCEPT	2
+#define SUDO_CONF_PATH_NOEXEC		3
+#define SUDO_CONF_PATH_PLUGIN_DIR	4
+#define SUDO_CONF_PATH_DEVSEARCH	5
+
+#define SUDO_CONF_PATH_INITIALIZER	{				\
+    { "askpass", sizeof("askpass") - 1, false, _PATH_SUDO_ASKPASS },	\
+    { "sesh", sizeof("sesh") - 1, false, _PATH_SUDO_SESH },		\
+    { "intercept", sizeof("intercept") - 1, false, _PATH_SUDO_INTERCEPT },	\
+    { "noexec", sizeof("noexec") - 1, false, _PATH_SUDO_NOEXEC },	\
+    { "plugin_dir", sizeof("plugin_dir") - 1, false, _PATH_SUDO_PLUGIN_DIR }, \
+    { "devsearch", sizeof("devsearch") - 1, false, _PATH_SUDO_DEVSEARCH }, \
+    { NULL } \
+}
+
+/*
+ * getgroups(2) on macOS is flakey with respect to non-local groups. 
+ * Even with _DARWIN_UNLIMITED_GETGROUPS set we may not get all groups./
+ * See bug #946 for details.
+ */
+#ifdef __APPLE__
+# define GROUP_SOURCE_DEFAULT	GROUP_SOURCE_DYNAMIC
+#else
+# define GROUP_SOURCE_DEFAULT	GROUP_SOURCE_ADAPTIVE
+#endif
+
+#define SUDO_CONF_SETTINGS_INITIALIZER	{				\
+    false,			/* updated */				\
+    true,			/* disable_coredump */			\
+    true,			/* probe_interfaces */			\
+    GROUP_SOURCE_DEFAULT,	/* group_source */			\
+    -1				/* max_groups */			\
+}
+
+static struct sudo_conf_data {
+    struct sudo_conf_settings settings;
+    struct sudo_conf_debug_list debugging;
+    struct plugin_info_list plugins;
+    struct sudo_conf_path_table path_table[7];
+} sudo_conf_data = {
+    SUDO_CONF_SETTINGS_INITIALIZER,
+    TAILQ_HEAD_INITIALIZER(sudo_conf_data.debugging),
+    TAILQ_HEAD_INITIALIZER(sudo_conf_data.plugins),
+    SUDO_CONF_PATH_INITIALIZER
+};
+
+/*
+ * "Set variable_name value"
+ */
+static int
+parse_variable(const char *entry, const char *conf_file, unsigned int lineno)
+{
+    struct sudo_conf_table *var;
+    int ret;
+    debug_decl(parse_variable, SUDO_DEBUG_UTIL);
+
+    for (var = sudo_conf_var_table; var->name != NULL; var++) {
+	if (strncmp(entry, var->name, var->namelen) == 0 &&
+	    isblank((unsigned char)entry[var->namelen])) {
+	    entry += var->namelen + 1;
+	    while (isblank((unsigned char)*entry))
+		entry++;
+	    ret = var->parser(entry, conf_file, lineno);
+	    sudo_debug_printf(ret ? SUDO_DEBUG_INFO : SUDO_DEBUG_ERROR,
+		"%s: %s:%u: Set %s %s", __func__, conf_file,
+		lineno, var->name, entry);
+	    debug_return_int(ret);
+	}
+    }
+    sudo_debug_printf(SUDO_DEBUG_WARN, "%s: %s:%u: unknown setting %s",
+	__func__, conf_file, lineno, entry);
+    debug_return_int(false);
+}
+
+/*
+ * "Path name /path/to/file"
+ * If path is missing it will be set to the NULL pointer.
+ */
+static int
+parse_path(const char *entry, const char *conf_file, unsigned int lineno)
+{
+    const char *entry_end = entry + strlen(entry);
+    const char *ep, *name, *path;
+    struct sudo_conf_path_table *cur;
+    size_t namelen;
+    debug_decl(parse_path, SUDO_DEBUG_UTIL);
+
+    /* Parse name. */
+    name = sudo_strsplit(entry, entry_end, " \t", &ep);
+    if (name == NULL)
+	goto bad;
+    namelen = (size_t)(ep - name);
+
+    /* Parse path (if present). */
+    path = sudo_strsplit(NULL, entry_end, " \t", &ep);
+
+    /* Match supported paths, ignoring unknown paths. */
+    for (cur = sudo_conf_data.path_table; cur->pname != NULL; cur++) {
+	if (namelen == cur->pnamelen &&
+	    strncasecmp(name, cur->pname, cur->pnamelen) == 0) {
+	    char *pval = NULL;
+	    if (path != NULL) {
+		if ((pval = strdup(path)) == NULL) {
+		    sudo_warnx(U_("%s: %s"), __func__,
+			U_("unable to allocate memory"));
+		    debug_return_int(-1);
+		}
+	    }
+	    if (cur->dynamic)
+		free((char *)cur->pval);
+	    cur->pval = pval;
+	    cur->dynamic = true;
+	    sudo_debug_printf(SUDO_DEBUG_INFO, "%s: %s:%u: Path %s %s",
+		__func__, conf_file, lineno, cur->pname,
+		pval ? pval : "(none)");
+	    debug_return_int(true);
+	}
+    }
+    sudo_debug_printf(SUDO_DEBUG_WARN, "%s: %s:%u: unknown path %s",
+	__func__, conf_file, lineno, entry);
+    debug_return_int(false);
+bad:
+    sudo_warnx(U_("invalid Path value \"%s\" in %s, line %u"),
+	entry, conf_file, lineno);
+    debug_return_int(false);
+}
+
+/*
+ * "Debug program /path/to/log flags,..."
+ */
+static int
+parse_debug(const char *entry, const char *conf_file, unsigned int lineno)
+{
+    struct sudo_conf_debug *debug_spec;
+    struct sudo_debug_file *debug_file = NULL;
+    const char *ep, *path, *progname, *flags;
+    const char *entry_end = entry + strlen(entry);
+    size_t pathlen, prognamelen;
+    debug_decl(parse_debug, SUDO_DEBUG_UTIL);
+
+    /* Parse progname. */
+    progname = sudo_strsplit(entry, entry_end, " \t", &ep);
+    if (progname == NULL)
+	debug_return_int(false);	/* not enough fields */
+    prognamelen = (size_t)(ep - progname);
+
+    /* Parse path. */
+    path = sudo_strsplit(NULL, entry_end, " \t", &ep);
+    if (path == NULL)
+	debug_return_int(false);	/* not enough fields */
+    pathlen = (size_t)(ep - path);
+
+    /* Remainder is flags (freeform). */
+    flags = sudo_strsplit(NULL, entry_end, " \t", &ep);
+    if (flags == NULL)
+	debug_return_int(false);	/* not enough fields */
+
+    /* If progname already exists, use it, else alloc a new one. */
+    TAILQ_FOREACH(debug_spec, &sudo_conf_data.debugging, entries) {
+	if (strncmp(debug_spec->progname, progname, prognamelen) == 0 &&
+	    debug_spec->progname[prognamelen] == '\0')
+	    break;
+    }
+    if (debug_spec == NULL) {
+	debug_spec = malloc(sizeof(*debug_spec));
+	if (debug_spec == NULL)
+	    goto oom;
+	debug_spec->progname = strndup(progname, prognamelen);
+	if (debug_spec->progname == NULL) {
+	    free(debug_spec);
+	    debug_spec = NULL;
+	    goto oom;
+	}
+	TAILQ_INIT(&debug_spec->debug_files);
+	TAILQ_INSERT_TAIL(&sudo_conf_data.debugging, debug_spec, entries);
+    }
+    debug_file = calloc(1, sizeof(*debug_file));
+    if (debug_file == NULL)
+	goto oom;
+    debug_file->debug_file = strndup(path, pathlen);
+    if (debug_file->debug_file == NULL)
+	goto oom;
+    debug_file->debug_flags = strdup(flags);
+    if (debug_file->debug_flags == NULL)
+	goto oom;
+    TAILQ_INSERT_TAIL(&debug_spec->debug_files, debug_file, entries);
+
+    debug_return_int(true);
+oom:
+    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+    if (debug_file != NULL) {
+	free(debug_file->debug_file);
+	free(debug_file->debug_flags);
+	free(debug_file);
+    }
+    debug_return_int(-1);
+}
+
+/*
+ * "Plugin symbol /path/to/log args..."
+ */
+static int
+parse_plugin(const char *entry, const char *conf_file, unsigned int lineno)
+{
+    struct plugin_info *info = NULL;
+    const char *ep, *path, *symbol;
+    const char *entry_end = entry + strlen(entry);
+    char **options = NULL;
+    size_t pathlen, symlen;
+    unsigned int nopts = 0;
+    debug_decl(parse_plugin, SUDO_DEBUG_UTIL);
+
+    /* Parse symbol. */
+    symbol = sudo_strsplit(entry, entry_end, " \t", &ep);
+    if (symbol == NULL)
+	debug_return_int(false);	/* not enough fields */
+    symlen = (size_t)(ep - symbol);
+
+    /* Parse path. */
+    path = sudo_strsplit(NULL, entry_end, " \t", &ep);
+    if (path == NULL)
+	debug_return_int(false);	/* not enough fields */
+    pathlen = (size_t)(ep - path);
+
+    /* Split options into an array if present. */
+    while (isblank((unsigned char)*ep))
+	ep++;
+    if (*ep != '\0') {
+	/* Count number of options and allocate array. */
+	const char *cp, *opt = ep;
+
+	/* Count and allocate options array. */
+	for (nopts = 0, cp = sudo_strsplit(opt, entry_end, " \t", &ep);
+	    cp != NULL; cp = sudo_strsplit(NULL, entry_end, " \t", &ep)) {
+	    nopts++;
+	}
+	options = reallocarray(NULL, nopts + 1, sizeof(*options));
+	if (options == NULL)
+	    goto oom;
+
+	/* Fill in options array. */
+	for (nopts = 0, cp = sudo_strsplit(opt, entry_end, " \t", &ep);
+	    cp != NULL; cp = sudo_strsplit(NULL, entry_end, " \t", &ep)) {
+	    options[nopts] = strndup(cp, (size_t)(ep - cp));
+	    if (options[nopts] == NULL)
+		goto oom;
+	    nopts++;
+	}
+	options[nopts] = NULL;
+    }
+
+    info = calloc(sizeof(*info), 1);
+    if (info == NULL)
+	    goto oom;
+    info->symbol_name = strndup(symbol, symlen);
+    if (info->symbol_name == NULL)
+	    goto oom;
+    info->path = strndup(path, pathlen);
+    if (info->path == NULL)
+	    goto oom;
+    info->options = options;
+    info->lineno = lineno;
+    TAILQ_INSERT_TAIL(&sudo_conf_data.plugins, info, entries);
+
+    debug_return_int(true);
+oom:
+    sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+    if (options != NULL) {
+	while (nopts--)
+	    free(options[nopts]);
+	free(options);
+    }
+    if (info != NULL) {
+	free(info->symbol_name);
+	free(info->path);
+	free(info);
+    }
+    debug_return_int(-1);
+}
+
+static int
+set_var_disable_coredump(const char *strval, const char *conf_file,
+    unsigned int lineno)
+{
+    int val = sudo_strtobool(strval);
+    debug_decl(set_var_disable_coredump, SUDO_DEBUG_UTIL);
+
+    if (val == -1) {
+	sudo_warnx(U_("invalid value for %s \"%s\" in %s, line %u"),
+	    "disable_coredump", strval, conf_file, lineno);
+	debug_return_int(false);
+    }
+    sudo_conf_data.settings.disable_coredump = val;
+    debug_return_int(true);
+}
+
+static int
+set_var_group_source(const char *strval, const char *conf_file,
+    unsigned int lineno)
+{
+    debug_decl(set_var_group_source, SUDO_DEBUG_UTIL);
+
+    if (strcasecmp(strval, "adaptive") == 0) {
+	sudo_conf_data.settings.group_source = GROUP_SOURCE_ADAPTIVE;
+    } else if (strcasecmp(strval, "static") == 0) {
+	sudo_conf_data.settings.group_source = GROUP_SOURCE_STATIC;
+    } else if (strcasecmp(strval, "dynamic") == 0) {
+	sudo_conf_data.settings.group_source = GROUP_SOURCE_DYNAMIC;
+    } else {
+	sudo_warnx(U_("unsupported group source \"%s\" in %s, line %u"), strval,
+	    conf_file, lineno);
+	debug_return_int(false);
+    }
+    debug_return_int(true);
+}
+
+static int
+set_var_max_groups(const char *strval, const char *conf_file,
+    unsigned int lineno)
+{
+    int max_groups;
+    debug_decl(set_var_max_groups, SUDO_DEBUG_UTIL);
+
+    max_groups = sudo_strtonum(strval, 1, 1024, NULL);
+    if (max_groups <= 0) {
+	sudo_warnx(U_("invalid max groups \"%s\" in %s, line %u"), strval,
+	    conf_file, lineno);
+	debug_return_int(false);
+    }
+    sudo_conf_data.settings.max_groups = max_groups;
+    debug_return_int(true);
+}
+
+static int
+set_var_probe_interfaces(const char *strval, const char *conf_file,
+    unsigned int lineno)
+{
+    int val = sudo_strtobool(strval);
+    debug_decl(set_var_probe_interfaces, SUDO_DEBUG_UTIL);
+
+    if (val == -1) {
+	sudo_warnx(U_("invalid value for %s \"%s\" in %s, line %u"),
+	    "probe_interfaces", strval, conf_file, lineno);
+	debug_return_int(false);
+    }
+    sudo_conf_data.settings.probe_interfaces = val;
+    debug_return_int(true);
+}
+
+const char *
+sudo_conf_askpass_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_ASKPASS].pval;
+}
+
+const char *
+sudo_conf_sesh_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_SESH].pval;
+}
+
+const char *
+sudo_conf_intercept_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_INTERCEPT].pval;
+}
+
+const char *
+sudo_conf_noexec_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_NOEXEC].pval;
+}
+
+const char *
+sudo_conf_plugin_dir_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_PLUGIN_DIR].pval;
+}
+
+const char *
+sudo_conf_devsearch_path_v1(void)
+{
+    return sudo_conf_data.path_table[SUDO_CONF_PATH_DEVSEARCH].pval;
+}
+
+int
+sudo_conf_group_source_v1(void)
+{
+    return sudo_conf_data.settings.group_source;
+}
+
+int
+sudo_conf_max_groups_v1(void)
+{
+    return sudo_conf_data.settings.max_groups;
+}
+
+struct plugin_info_list *
+sudo_conf_plugins_v1(void)
+{
+    return &sudo_conf_data.plugins;
+}
+
+struct sudo_conf_debug_list *
+sudo_conf_debugging_v1(void)
+{
+    return &sudo_conf_data.debugging;
+}
+
+/* Return the debug files list for a program, or NULL if none. */
+struct sudo_conf_debug_file_list *
+sudo_conf_debug_files_v1(const char *progname)
+{
+    struct sudo_conf_debug *debug_spec;
+    const char *progbase;
+    debug_decl(sudo_conf_debug_files, SUDO_DEBUG_UTIL);
+
+    /* Determine basename if program is fully qualified (like for plugins). */
+    progbase = progname[0] == '/' ? sudo_basename(progname) : progname;
+
+    /* Convert sudoedit -> sudo. */
+    if (strcmp(progbase, "sudoedit") == 0)
+	progbase = "sudo";
+
+    TAILQ_FOREACH(debug_spec, &sudo_conf_data.debugging, entries) {
+	const char *prog = progbase;
+
+	if (debug_spec->progname[0] == '/') {
+	    /* Match fully-qualified name, if possible. */
+	    prog = progname;
+	}
+	if (strcmp(debug_spec->progname, prog) == 0)
+	    debug_return_ptr(&debug_spec->debug_files);
+    }
+    debug_return_ptr(NULL);
+}
+
+bool
+sudo_conf_developer_mode_v1(void)
+{
+    /* Developer mode was removed in sudo 1.9.13. */
+    return false;
+}
+
+bool
+sudo_conf_disable_coredump_v1(void)
+{
+    return sudo_conf_data.settings.disable_coredump;
+}
+
+bool
+sudo_conf_probe_interfaces_v1(void)
+{
+    return sudo_conf_data.settings.probe_interfaces;
+}
+
+/*
+ * Free dynamically allocated parts of sudo_conf_data and
+ * reset to initial values.
+ */
+static void
+sudo_conf_init(int conf_types)
+{
+    struct sudo_conf_debug *debug_spec;
+    struct sudo_debug_file *debug_file;
+    struct plugin_info *plugin_info;
+    int i;
+    debug_decl(sudo_conf_init, SUDO_DEBUG_UTIL);
+
+    /* Free and reset paths. */
+    if (ISSET(conf_types, SUDO_CONF_PATHS)) {
+	const struct sudo_conf_path_table path_table[] = SUDO_CONF_PATH_INITIALIZER;
+	sudo_conf_clear_paths();
+	memcpy(sudo_conf_data.path_table, path_table,
+	    sizeof(sudo_conf_data.path_table));
+    }
+
+    /* Free and reset debug settings. */
+    if (ISSET(conf_types, SUDO_CONF_DEBUG)) {
+	while ((debug_spec = TAILQ_FIRST(&sudo_conf_data.debugging))) {
+	    TAILQ_REMOVE(&sudo_conf_data.debugging, debug_spec, entries);
+	    free(debug_spec->progname);
+	    while ((debug_file = TAILQ_FIRST(&debug_spec->debug_files))) {
+		TAILQ_REMOVE(&debug_spec->debug_files, debug_file, entries);
+		free(debug_file->debug_file);
+		free(debug_file->debug_flags);
+		free(debug_file);
+	    }
+	    free(debug_spec);
+	}
+    }
+
+    /* Free and reset plugins. */
+    if (ISSET(conf_types, SUDO_CONF_PLUGINS)) {
+	while ((plugin_info = TAILQ_FIRST(&sudo_conf_data.plugins))) {
+	    TAILQ_REMOVE(&sudo_conf_data.plugins, plugin_info, entries);
+	    free(plugin_info->symbol_name);
+	    free(plugin_info->path);
+	    if (plugin_info->options != NULL) {
+		for (i = 0; plugin_info->options[i] != NULL; i++)
+		    free(plugin_info->options[i]);
+		free(plugin_info->options);
+	    }
+	    free(plugin_info);
+	}
+    }
+
+    /* Set initial values. */
+    if (ISSET(conf_types, SUDO_CONF_SETTINGS)) {
+	const struct sudo_conf_settings settings = SUDO_CONF_SETTINGS_INITIALIZER;
+	sudo_conf_data.settings = settings;
+    }
+
+    debug_return;
+}
+
+/*
+ * Read in /etc/sudo.conf and populates sudo_conf_data.
+ */
+int
+sudo_conf_read_v1(const char *conf_file, int conf_types)
+{
+    FILE *fp = NULL;
+    int fd, ret = false;
+    char *prev_locale, *line = NULL;
+    unsigned int conf_lineno = 0;
+    size_t linesize = 0;
+    debug_decl(sudo_conf_read, SUDO_DEBUG_UTIL);
+
+    if ((prev_locale = setlocale(LC_ALL, NULL)) == NULL) {
+	sudo_warn("setlocale(LC_ALL, NULL)");
+	debug_return_int(-1);
+    }
+    if ((prev_locale = strdup(prev_locale)) == NULL) {
+	sudo_warnx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
+	debug_return_int(-1);
+    }
+
+    /* Parse sudo.conf in the "C" locale. */
+    if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
+        setlocale(LC_ALL, "C");
+
+#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
+    if (conf_file == NULL) {
+	struct stat sb;
+	int error;
+
+	conf_file = _PATH_SUDO_CONF;
+	fd = sudo_secure_open_file(conf_file, ROOT_UID, -1, &sb, &error);
+	if (fd == -1) {
+	    switch (error) {
+	    case SUDO_PATH_MISSING:
+		/* Root should always be able to read sudo.conf. */
+		if (errno != ENOENT && geteuid() == ROOT_UID)
+		    sudo_warn(U_("unable to open %s"), conf_file);
+		break;
+	    case SUDO_PATH_BAD_TYPE:
+		sudo_warnx(U_("%s is not a regular file"), conf_file);
+		break;
+	    case SUDO_PATH_WRONG_OWNER:
+		sudo_warnx(U_("%s is owned by uid %u, should be %u"),
+		    conf_file, (unsigned int) sb.st_uid, ROOT_UID);
+		break;
+	    case SUDO_PATH_WORLD_WRITABLE:
+		sudo_warnx(U_("%s is world writable"), conf_file);
+		break;
+	    case SUDO_PATH_GROUP_WRITABLE:
+		sudo_warnx(U_("%s is group writable"), conf_file);
+		break;
+	    default:
+		sudo_warnx("%s: internal error, unexpected error %d",
+		    __func__, error);
+		break;
+	    }
+	    goto done;
+	}
+    } else
+#else
+    if (conf_file == NULL)
+	conf_file = _PATH_SUDO_CONF;
+#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
+    {
+	fd = open(conf_file, O_RDONLY);
+	if (fd == -1) {
+	    sudo_warn(U_("unable to open %s"), conf_file);
+	    goto done;
+	}
+    }
+
+    if ((fp = fdopen(fd, "r")) == NULL) {
+	if (errno != ENOENT && geteuid() == ROOT_UID)
+	    sudo_warn(U_("unable to open %s"), conf_file);
+	close(fd);
+	goto done;
+    }
+
+    /* Reset to initial values if necessary. */
+    if (sudo_conf_data.settings.updated)
+	sudo_conf_init(conf_types);
+
+    while (sudo_parseln(&line, &linesize, &conf_lineno, fp, 0) != -1) {
+	struct sudo_conf_table *cur;
+	unsigned int i;
+	char *cp;
+
+	if (*(cp = line) == '\0')
+	    continue;		/* empty line or comment */
+
+	for (i = 0, cur = sudo_conf_table; cur->name != NULL; i++, cur++) {
+	    if (strncasecmp(cp, cur->name, cur->namelen) == 0 &&
+		isblank((unsigned char)cp[cur->namelen])) {
+		if (ISSET(conf_types, (1 << i))) {
+		    cp += cur->namelen;
+		    while (isblank((unsigned char)*cp))
+			cp++;
+		    ret = cur->parser(cp, conf_file, conf_lineno);
+		    switch (ret) {
+		    case true:
+			sudo_conf_data.settings.updated = true;
+			break;
+		    case false:
+			break;
+		    default:
+			goto done;
+		    }
+		}
+		break;
+	    }
+	}
+	if (cur->name == NULL) {
+	    sudo_debug_printf(SUDO_DEBUG_WARN,
+		"%s: %s:%u: unsupported entry: %s", __func__, conf_file,
+		conf_lineno, line);
+	}
+    }
+    ret = true;
+
+done:
+    if (fp != NULL)
+	fclose(fp);
+    free(line);
+
+    /* Restore locale if needed. */
+    if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
+        setlocale(LC_ALL, prev_locale);
+    free(prev_locale);
+    debug_return_int(ret);
+}
+
+/*
+ * Used by the sudo_conf regress test to clear compile-time path settings.
+ */
+void
+sudo_conf_clear_paths_v1(void)
+{
+    struct sudo_conf_path_table *cur;
+    debug_decl(sudo_conf_clear_paths, SUDO_DEBUG_UTIL);
+
+    for (cur = sudo_conf_data.path_table; cur->pname != NULL; cur++) {
+	if (cur->dynamic)
+	    free((char *)cur->pval);
+	cur->pval = NULL;
+	cur->dynamic = false;
+    }
+}