mirror of https://github.com/sudo-project/sudo.git
514 lines
16 KiB
C
514 lines
16 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 1993-1996, 1998-2005, 2007-2024
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* Todd C. Miller <Todd.Miller@sudo.ws>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* Sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F39502-99-1-0512.
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*/
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#ifndef SUDOERS_SUDOERS_H
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#define SUDOERS_SUDOERS_H
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#include <sys/types.h> /* dev_t, gid_t, mode_t, pid_t, size_t, uid_t */
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#include <limits.h>
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#ifdef HAVE_STDBOOL_H
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# include <stdbool.h>
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#else
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# include <compat/stdbool.h>
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#endif /* HAVE_STDBOOL_H */
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#define DEFAULT_TEXT_DOMAIN "sudoers"
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#include <pathnames.h>
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#include <sudo_compat.h>
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#include <sudo_conf.h>
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#include <sudo_eventlog.h>
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#include <sudo_fatal.h>
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#include <sudo_gettext.h>
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#include <sudo_nss.h>
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#include <sudo_plugin.h>
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#include <sudo_queue.h>
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#include <sudo_util.h>
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#include <sudoers_debug.h>
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#include <defaults.h>
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#include <logging.h>
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#include <parse.h>
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#include <pivot.h>
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/*
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* Info passed in from the sudo front-end.
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*/
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struct sudoers_open_info {
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char * const *settings;
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char * const *user_info;
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char * const *plugin_args;
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};
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/*
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* Supplementary group IDs for a user.
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*/
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struct gid_list {
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int ngids;
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GETGROUPS_T *gids;
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};
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/*
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* Supplementary group names for a user.
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*/
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struct group_list {
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int ngroups;
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char **groups;
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};
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/*
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* Parse configuration settings.
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*/
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struct sudoers_parser_config {
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const char *sudoers_path;
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int strict;
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int verbose;
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bool recovery;
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bool ignore_perms;
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mode_t sudoers_mode;
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uid_t sudoers_uid;
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gid_t sudoers_gid;
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};
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#define SUDOERS_PARSER_CONFIG_INITIALIZER { \
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.sudoers_path = NULL, \
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.strict = false, \
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.verbose = 1, \
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.recovery = true, \
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.ignore_perms = false, \
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.sudoers_mode = SUDOERS_MODE, \
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.sudoers_uid = SUDOERS_UID, \
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.sudoers_gid = SUDOERS_GID \
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}
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/*
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* Settings passed in from the sudo front-end.
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*/
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struct sudoers_plugin_settings {
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const char *plugin_dir;
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const char *ldap_conf;
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const char *ldap_secret;
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unsigned int flags;
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};
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#define SUDOERS_PLUGIN_SETTINGS_INITIALIZER { \
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.plugin_dir = _PATH_SUDO_PLUGIN_DIR, \
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.ldap_conf = _PATH_LDAP_CONF, \
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.ldap_secret = _PATH_LDAP_SECRET \
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}
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/*
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* Info pertaining to the invoking user.
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*/
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struct sudoers_user_context {
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struct passwd *pw;
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struct stat *cmnd_stat;
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char *cwd;
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char *name;
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char *path;
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char *tty;
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char *ttypath;
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char *host;
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char *shost;
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char *prompt;
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char *cmnd;
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char *cmnd_args;
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char *cmnd_base;
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char *cmnd_dir;
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char *cmnd_list;
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char *ccname;
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struct gid_list *gid_list;
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char * const * envp;
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char * const * env_add;
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int closefrom;
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int lines;
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int cols;
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int timeout;
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dev_t ttydev;
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mode_t umask;
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uid_t euid;
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uid_t uid;
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uid_t egid;
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uid_t gid;
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pid_t pid;
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pid_t ppid;
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pid_t sid;
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pid_t tcpgid;
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};
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/*
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* Info pertaining to the runas user.
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*/
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struct sudoers_runas_context {
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int execfd;
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int argc;
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char **argv;
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char **argv_saved;
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struct passwd *pw;
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struct group *gr;
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struct passwd *list_pw;
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char *chroot;
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char *class;
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char *cmnd;
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char *cmnd_saved;
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char *cwd;
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char *group;
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char *host;
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char *shost;
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char *user;
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char *role;
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char *type;
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char *apparmor_profile;
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char *privs;
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char *limitprivs;
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};
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/*
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* Global configuration for the sudoers module.
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*/
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struct sudoers_context {
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struct sudoers_parser_config parser_conf;
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struct sudoers_plugin_settings settings;
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struct sudoers_user_context user;
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struct sudoers_runas_context runas;
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struct timespec start_time;
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char *source;
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char *iolog_file;
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char *iolog_dir;
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char *iolog_path;
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int sudoedit_nfiles;
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unsigned int mode;
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char uuid_str[37];
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};
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#define SUDOERS_CONTEXT_INITIALIZER { \
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SUDOERS_PARSER_CONFIG_INITIALIZER, \
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SUDOERS_PLUGIN_SETTINGS_INITIALIZER, \
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}
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/*
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* sudo_get_gidlist() type values
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*/
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#define ENTRY_TYPE_ANY 0x00
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#define ENTRY_TYPE_QUERIED 0x01
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#define ENTRY_TYPE_FRONTEND 0x02
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/*
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* sudoers_plugin_settings.flag values
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*/
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#define RUNAS_USER_SPECIFIED 0x01U
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#define RUNAS_GROUP_SPECIFIED 0x02U
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#define CAN_INTERCEPT_SETID 0x04U
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#define HAVE_INTERCEPT_PTRACE 0x08U
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#define USER_INTERCEPT_SETID 0x10U
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/*
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* Return values for sudoers_lookup(), also used as arguments for log_auth()
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* Note: cannot use '0' as a value here.
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*/
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#define VALIDATE_ERROR 0x001U
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#define VALIDATE_SUCCESS 0x002U
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#define VALIDATE_FAILURE 0x004U
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#define FLAG_CHECK_USER 0x010U
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#define FLAG_NO_USER 0x020U
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#define FLAG_NO_HOST 0x040U
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#define FLAG_NO_CHECK 0x080U
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#define FLAG_NO_USER_INPUT 0x100U
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#define FLAG_BAD_PASSWORD 0x200U
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#define FLAG_INTERCEPT_SETID 0x400U
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/*
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* Return values for check_user() (rowhammer resistant).
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*/
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#undef AUTH_SUCCESS
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#define AUTH_SUCCESS 0x52a2925 /* 0101001010100010100100100101 */
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#undef AUTH_FAILURE
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#define AUTH_FAILURE 0xad5d6da /* 1010110101011101011011011010 */
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#undef AUTH_ERROR
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#define AUTH_ERROR 0x1fc8d3ac /* 11111110010001101001110101100 */
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/*
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* find_path()/set_cmnd() return values
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*/
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#define FOUND 0
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#define NOT_FOUND 1
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#define NOT_FOUND_DOT 2
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#define NOT_FOUND_ERROR 3
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#define NOT_FOUND_PATH 4
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/*
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* Various modes sudo can be in (based on arguments) in hex
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*/
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#define MODE_RUN 0x00000001U
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#define MODE_EDIT 0x00000002U
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#define MODE_VALIDATE 0x00000004U
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#define MODE_INVALIDATE 0x00000008U
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#define MODE_VERSION 0x00000010U
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#define MODE_HELP 0x00000020U
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#define MODE_LIST 0x00000040U
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#define MODE_CHECK 0x00000080U
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#define MODE_ERROR 0x00000100U
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#define MODE_MASK 0x0000ffffU
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/* Mode flags */
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#define MODE_ASKPASS 0x00010000U
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#define MODE_SHELL 0x00020000U
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#define MODE_LOGIN_SHELL 0x00040000U
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#define MODE_IMPLIED_SHELL 0x00080000U
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#define MODE_RESET_HOME 0x00100000U
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#define MODE_PRESERVE_GROUPS 0x00200000U
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#define MODE_PRESERVE_ENV 0x00400000U
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#define MODE_NONINTERACTIVE 0x00800000U
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#define MODE_IGNORE_TICKET 0x01000000U
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#define MODE_UPDATE_TICKET 0x02000000U
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#define MODE_POLICY_INTERCEPTED 0x04000000U
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/* Mode bits allowed for intercepted commands. */
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#define MODE_INTERCEPT_MASK (MODE_RUN|MODE_NONINTERACTIVE|MODE_IGNORE_TICKET|MODE_POLICY_INTERCEPTED)
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/*
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* Used with set_perms()
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*/
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#define PERM_INITIAL 0x00
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#define PERM_ROOT 0x01
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#define PERM_USER 0x02
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#define PERM_FULL_USER 0x03
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#define PERM_SUDOERS 0x04
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#define PERM_RUNAS 0x05
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#define PERM_TIMESTAMP 0x06
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#define PERM_IOLOG 0x07
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/* Default sudoers uid/gid/mode if not set by the Makefile. */
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#ifndef SUDOERS_UID
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# define SUDOERS_UID 0
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#endif
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#ifndef SUDOERS_GID
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# define SUDOERS_GID 0
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#endif
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#ifndef SUDOERS_MODE
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# define SUDOERS_MODE 0600
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#endif
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struct sudo_lbuf;
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struct passwd;
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struct stat;
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/*
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* Function prototypes
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*/
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/* goodpath.c */
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bool sudo_goodpath(const char *path, struct stat *sbp);
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/* findpath.c */
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int find_path(const char *infile, char **outfile, struct stat *sbp,
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const char *path, bool ignore_dot, char * const *allowlist);
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/* resolve_cmnd.c */
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int resolve_cmnd(struct sudoers_context *ctx, const char *infile,
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char **outfile, const char *path);
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/* check.c */
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int check_user(struct sudoers_context *ctx, unsigned int validated, unsigned int mode);
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bool user_is_exempt(const struct sudoers_context *ctx);
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/* check_util.c */
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int check_user_runchroot(const char *runchroot);
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int check_user_runcwd(const char *runcwd);
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/* prompt.c */
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char *expand_prompt(const struct sudoers_context *ctx, const char *restrict old_prompt, const char *restrict auth_user);
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/* sudo_auth.c */
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bool sudo_auth_needs_end_session(void);
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int verify_user(const struct sudoers_context *ctx, struct passwd *pw, char *prompt, unsigned int validated, struct sudo_conv_callback *callback);
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int sudo_auth_begin_session(const struct sudoers_context *ctx, struct passwd *pw, char **user_env[]);
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int sudo_auth_end_session(void);
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int sudo_auth_init(const struct sudoers_context *ctx, struct passwd *pw, unsigned int mode);
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int sudo_auth_approval(const struct sudoers_context *ctx, struct passwd *pw, unsigned int validated, bool exempt);
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int sudo_auth_cleanup(const struct sudoers_context *ctx, struct passwd *pw, bool force);
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/* set_perms.c */
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bool rewind_perms(void);
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bool set_perms(const struct sudoers_context *, int);
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bool restore_perms(void);
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int pam_prep_user(struct passwd *);
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/* defaults.c */
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void dump_defaults(void);
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void dump_auth_methods(void);
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/* getspwuid.c */
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char *sudo_getepw(const struct passwd *);
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/* pwutil.c */
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typedef struct cache_item * (*sudo_make_pwitem_t)(uid_t uid, const char *user);
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typedef struct cache_item * (*sudo_make_gritem_t)(gid_t gid, const char *group);
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typedef struct cache_item * (*sudo_make_gidlist_item_t)(const struct passwd *pw, int ngids, GETGROUPS_T *gids, char * const *gidstrs, unsigned int type);
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typedef struct cache_item * (*sudo_make_grlist_item_t)(const struct passwd *pw, char * const *groups);
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typedef bool (*sudo_valid_shell_t)(const char *shell);
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sudo_dso_public struct group *sudo_getgrgid(gid_t);
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sudo_dso_public struct group *sudo_getgrnam(const char *);
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sudo_dso_public void sudo_gr_addref(struct group *);
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sudo_dso_public void sudo_gr_delref(struct group *);
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bool user_in_group(const struct passwd *, const char *);
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struct group *sudo_fakegrnam(const char *);
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struct group *sudo_mkgrent(const char *group, gid_t gid, ...);
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struct gid_list *sudo_get_gidlist(const struct passwd *pw, unsigned int type);
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struct group_list *sudo_get_grlist(const struct passwd *pw);
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struct passwd *sudo_fakepwnam(const char *, gid_t);
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struct passwd *sudo_mkpwent(const char *user, uid_t uid, gid_t gid, const char *home, const char *shell);
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struct passwd *sudo_getpwnam(const char *);
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struct passwd *sudo_getpwuid(uid_t);
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void sudo_endspent(void);
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void sudo_freegrcache(void);
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void sudo_freepwcache(void);
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void sudo_gidlist_addref(struct gid_list *);
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void sudo_gidlist_delref(struct gid_list *);
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void sudo_grlist_addref(struct group_list *);
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void sudo_grlist_delref(struct group_list *);
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void sudo_pw_addref(struct passwd *);
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void sudo_pw_delref(struct passwd *);
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int sudo_set_gidlist(struct passwd *pw, int ngids, GETGROUPS_T *gids, char * const *gidstrs, unsigned int type);
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int sudo_set_grlist(struct passwd *pw, char * const *groups);
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int sudo_pwutil_get_max_groups(void);
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void sudo_pwutil_set_max_groups(int);
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void sudo_pwutil_set_backend(sudo_make_pwitem_t, sudo_make_gritem_t, sudo_make_gidlist_item_t, sudo_make_grlist_item_t, sudo_valid_shell_t);
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void sudo_setspent(void);
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bool user_shell_valid(const struct passwd *pw);
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/* timestr.c */
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char *get_timestr(time_t, int);
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/* boottime.c */
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bool get_boottime(struct timespec *);
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/* iolog.c */
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bool cb_maxseq(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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bool cb_iolog_user(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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bool cb_iolog_group(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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bool cb_iolog_mode(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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/* iolog_path_escapes.c */
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struct iolog_path_escape;
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extern const struct iolog_path_escape *sudoers_iolog_path_escapes;
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/* env.c */
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char **env_get(void);
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bool env_merge(const struct sudoers_context *ctx, char * const envp[]);
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bool env_swap_old(void);
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void env_free(void);
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bool env_init(char * const envp[]);
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bool init_envtables(void);
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bool insert_env_vars(char * const envp[]);
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bool read_env_file(const struct sudoers_context *ctx, const char *path, bool overwrite, bool restricted);
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bool rebuild_env(const struct sudoers_context *ctx);
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bool validate_env_vars(const struct sudoers_context *ctx, char * const envp[]);
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int sudo_setenv(const char *var, const char *val, int overwrite);
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int sudo_unsetenv(const char *var);
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char *sudo_getenv(const char *name);
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char *sudo_getenv_nodebug(const char *name);
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int sudo_putenv_nodebug(char *str, bool dupcheck, bool overwrite);
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int sudo_unsetenv_nodebug(const char *var);
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int sudoers_hook_getenv(const char *name, char **value, void *closure);
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int sudoers_hook_putenv(char *string, void *closure);
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int sudoers_hook_setenv(const char *name, const char *value, int overwrite, void *closure);
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int sudoers_hook_unsetenv(const char *name, void *closure);
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void register_env_file(void * (*ef_open)(const char *), void (*ef_close)(void *), char * (*ef_next)(void *, int *), bool sys);
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/* env_pattern.c */
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bool matches_env_pattern(const char *pattern, const char *var, bool *full_match);
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/* sudoers_cb.c */
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void set_callbacks(void);
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bool cb_log_input(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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bool cb_log_output(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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/* sudoers.c */
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FILE *open_sudoers(const char *, char **, bool, bool *);
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bool cb_runas_default(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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int set_cmnd_path(struct sudoers_context *ctx, const char *runchroot);
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void set_cmnd_status(struct sudoers_context *ctx, const char *runchroot);
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int sudoers_init(void *info, sudoers_logger_t logger, char * const envp[]);
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int sudoers_check_cmnd(int argc, char *const argv[], char *env_add[], void *closure);
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int sudoers_list(int argc, char *const argv[], const char *list_user, int verbose);
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int sudoers_validate_user(void);
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void sudoers_cleanup(void);
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bool sudoers_override_umask(void);
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const struct sudoers_context *sudoers_get_context(void);
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bool sudoers_set_mode(unsigned int flags, unsigned int mask);
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bool sudoers_set_log_format(enum def_tuple tuple);
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/* sudoers_ctx_free.c */
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void sudoers_ctx_free(struct sudoers_context *ctx);
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/* policy.c */
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unsigned int sudoers_policy_deserialize_info(struct sudoers_context *ctx, void *v, struct defaults_list *defaults);
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bool sudoers_policy_store_result(struct sudoers_context *ctx, bool accepted, char *argv[], char *envp[], mode_t cmnd_umask, char *iolog_path, void *v);
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bool sudoers_tty_present(struct sudoers_context *ctx);
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extern sudo_conv_t sudo_conv;
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extern sudo_printf_t sudo_printf;
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extern struct sudo_plugin_event * (*plugin_event_alloc)(void);
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/* group_plugin.c */
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void group_plugin_unload(void);
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int group_plugin_query(const char *user, const char *group,
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const struct passwd *pwd);
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bool cb_group_plugin(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op);
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/* editor.c */
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char *find_editor(int nfiles, char * const *files, int *argc_out,
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char ***argv_out, char * const *allowlist, const char **env_editor);
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/* exptilde.c */
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bool expand_tilde(char **path, const char *user);
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/* gc.c */
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enum sudoers_gc_types {
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GC_UNKNOWN,
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GC_VECTOR,
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GC_PTR
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};
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bool sudoers_gc_add(enum sudoers_gc_types type, void *ptr);
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bool sudoers_gc_remove(enum sudoers_gc_types type, void *ptr);
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void sudoers_gc_init(void);
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void sudoers_gc_run(void);
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/* canon_path.c */
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char *canon_path(const char *inpath);
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void canon_path_free(char *resolved);
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void canon_path_free_cache(void);
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/* strlcpy_unesc.c */
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size_t strlcpy_unescape(char *restrict dst, const char *restrict src, size_t size);
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/* strvec_join.c */
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char *strvec_join(char *const argv[], char sep, size_t (*cpy)(char *, const char *, size_t));
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/* unesc_str.c */
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void unescape_string(char *str);
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/* serialize_list.c */
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char *serialize_list(const char *varname, struct list_members *members);
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/* sethost.c */
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bool sudoers_sethost(struct sudoers_context *ctx, const char *host, const char *remhost);
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#endif /* SUDOERS_SUDOERS_H */
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