/src/sudo/lib/util/sudo_conf.c

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/*
 * SPDX-License-Identifier: ISC
 *
 * Copyright (c) 2009-2023 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 <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>
#ifdef HAVE_DLOPEN
# include <dlfcn.h>
#endif

#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(1, sizeof(*info));
    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 = (int)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);

#ifdef RTLD_MEMBER
  /* Handle names like sudoers.a(sudoers.so) for AIX. */
  const char *cp = strchr(prog, '(');
  const char *ep = strchr(prog, ')');
  if (cp != NULL && ep != NULL) {
      /* Match on the program name without the member. */
      size_t len = (size_t)(cp - prog);
      if (strncmp(debug_spec->progname, prog, len) == 0 &&
        debug_spec->progname[len] == '\0') {
    debug_return_ptr(&debug_spec->debug_files);
      }

      /* Match on the member itself. */
      cp++;
      len = (size_t)(ep - cp);
      if (strncmp(debug_spec->progname, cp, len) == 0 &&
        debug_spec->progname[len] == '\0') {
    debug_return_ptr(&debug_spec->debug_files);
      }
  }
#endif
    }
    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;
    size_t 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 *path, int conf_types)
{
    FILE *fp = NULL;
    int fd = -1, ret = false;
    char *prev_locale, *line = NULL;
    unsigned int conf_lineno = 0;
    char conf_file[PATH_MAX];
    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");

    if (path != NULL) {
  /* Caller specified a single file, which must exist. */
  if (strlcpy(conf_file, path, sizeof(conf_file)) >= sizeof(conf_file)) {
      errno = ENAMETOOLONG;
      sudo_warn("%s", path);
      goto done;
  }
  fd = open(conf_file, O_RDONLY);
  if (fd == -1) {
      sudo_warn(U_("unable to open %s"), conf_file);
      goto done;
  }
    } else {
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
  struct stat sb;
  int error;

  /* _PATH_SUDO_CONF is a colon-separated list of path. */
  fd = sudo_open_conf_path(_PATH_SUDO_CONF, conf_file,
      sizeof(conf_file), NULL);
  error = sudo_secure_fd(fd, S_IFREG, ROOT_UID, (gid_t)-1, &sb);
  switch (error) {
  case SUDO_PATH_SECURE:
      /* OK! */
      break;
  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);
      goto done;
  case SUDO_PATH_BAD_TYPE:
      sudo_warnx(U_("%s is not a regular file"), conf_file);
      goto done;
  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);
      goto done;
  case SUDO_PATH_WORLD_WRITABLE:
      sudo_warnx(U_("%s is world writable"), conf_file);
      goto done;
  case SUDO_PATH_GROUP_WRITABLE:
      sudo_warnx(U_("%s is group writable"), conf_file);
      goto done;
  default:
      sudo_warnx("%s: internal error, unexpected error %d",
    __func__, error);
      goto done;
  }
#else
  /* No default sudo.conf when fuzzing. */
  goto done;
#endif /* FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
    }

    if ((fp = fdopen(fd, "r")) == NULL) {
  sudo_warn(U_("unable to open %s"), conf_file);
  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;
  size_t 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);
    else if (fd != -1)
  close(fd);
    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;
    }
}

Coverage Report

Created: 2025-07-11 06:58