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v1.9.15
plugins/sudoers/sudoers.h
514 строк
16 KB
Todd C. Miller
Move the check for running setid commands in intercept mode to later.
02 ноя 2023, 22:44
02 ноя 2023, 22:44
886f141
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/* * SPDX-License-Identifier: ISC * * Copyright (c) 1993-1996, 1998-2005, 2007-2023 * 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. * * 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. */ #ifndef SUDOERS_SUDOERS_H #define SUDOERS_SUDOERS_H #include <sys/types.h> /* for gid_t, mode_t, pid_t, size_t, uid_t */ #include <limits.h> #ifdef HAVE_STDBOOL_H # include <stdbool.h> #else # include <compat/stdbool.h> #endif /* HAVE_STDBOOL_H */ #define DEFAULT_TEXT_DOMAIN "sudoers" #include <pathnames.h> #include <sudo_compat.h> #include <sudo_conf.h> #include <sudo_eventlog.h> #include <sudo_fatal.h> #include <sudo_gettext.h> #include <sudo_nss.h> #include <sudo_plugin.h> #include <sudo_queue.h> #include <sudo_util.h> #include <sudoers_debug.h> #include <defaults.h> #include <logging.h> #include <parse.h> #include <pivot.h> /* * Info passed in from the sudo front-end. */ struct sudoers_open_info { char * const *settings; char * const *user_info; char * const *plugin_args; }; /* * Supplementary group IDs for a user. */ struct gid_list { int ngids; GETGROUPS_T *gids; }; /* * Supplementary group names for a user. */ struct group_list { int ngroups; char **groups; }; /* * Parse configuration settings. */ struct sudoers_parser_config { const char *sudoers_path; int strict; int verbose; bool recovery; bool ignore_perms; mode_t sudoers_mode; uid_t sudoers_uid; gid_t sudoers_gid; }; #define SUDOERS_PARSER_CONFIG_INITIALIZER { \ NULL, /* sudoers_path */ \ false, /* strict */ \ 1, /* verbose level 1 */ \ true, /* recovery */ \ false, /* ignore_perms */ \ SUDOERS_MODE, \ SUDOERS_UID, \ SUDOERS_GID \ } /* * Settings passed in from the sudo front-end. */ struct sudoers_plugin_settings { const char *plugin_dir; const char *ldap_conf; const char *ldap_secret; unsigned int flags; }; /* * Info pertaining to the invoking user. */ struct sudoers_user_context { struct passwd *pw; struct stat *cmnd_stat; char *cwd; char *name; char *path; char *tty; char *ttypath; char *host; char *shost; char *prompt; char *cmnd; char *cmnd_args; char *cmnd_base; char *cmnd_dir; char *cmnd_list; char *ccname; struct gid_list *gid_list; char * const * envp; char * const * env_add; int closefrom; int lines; int cols; int timeout; mode_t umask; uid_t euid; uid_t uid; uid_t egid; uid_t gid; pid_t pid; pid_t ppid; pid_t sid; pid_t tcpgid; }; /* * Info pertaining to the runas user. */ struct sudoers_runas_context { int execfd; int argc; char **argv; char **argv_saved; struct passwd *pw; struct group *gr; struct passwd *list_pw; char *chroot; char *class; char *cmnd; char *cmnd_saved; char *cwd; char *group; char *host; char *shost; char *user; #ifdef HAVE_SELINUX char *role; char *type; #endif #ifdef HAVE_APPARMOR char *apparmor_profile; #endif #ifdef HAVE_PRIV_SET char *privs; char *limitprivs; #endif }; #define SUDOERS_CONTEXT_INITIALIZER { \ SUDOERS_PARSER_CONFIG_INITIALIZER, \ { _PATH_LDAP_CONF, _PATH_LDAP_SECRET, _PATH_SUDO_PLUGIN_DIR } \ } /* * Global configuration for the sudoers module. */ struct sudoers_context { struct sudoers_parser_config parser_conf; struct sudoers_plugin_settings settings; struct sudoers_user_context user; struct sudoers_runas_context runas; struct timespec submit_time; char *source; char *iolog_file; char *iolog_dir; char *iolog_path; int sudoedit_nfiles; unsigned int mode; char uuid_str[37]; }; /* * sudo_get_gidlist() type values */ #define ENTRY_TYPE_ANY 0x00 #define ENTRY_TYPE_QUERIED 0x01 #define ENTRY_TYPE_FRONTEND 0x02 /* * sudoers_plugin_settings.flag values */ #define RUNAS_USER_SPECIFIED 0x01U #define RUNAS_GROUP_SPECIFIED 0x02U #define CAN_INTERCEPT_SETID 0x04U #define HAVE_INTERCEPT_PTRACE 0x08U #define USER_INTERCEPT_SETID 0x10U /* * Return values for sudoers_lookup(), also used as arguments for log_auth() * Note: cannot use '0' as a value here. */ #define VALIDATE_ERROR 0x001U #define VALIDATE_SUCCESS 0x002U #define VALIDATE_FAILURE 0x004U #define FLAG_CHECK_USER 0x010U #define FLAG_NO_USER 0x020U #define FLAG_NO_HOST 0x040U #define FLAG_NO_CHECK 0x080U #define FLAG_NO_USER_INPUT 0x100U #define FLAG_BAD_PASSWORD 0x200U #define FLAG_INTERCEPT_SETID 0x400U /* * Return values for check_user() (rowhammer resistant). */ #undef AUTH_SUCCESS #define AUTH_SUCCESS 0x52a2925 /* 0101001010100010100100100101 */ #undef AUTH_FAILURE #define AUTH_FAILURE 0xad5d6da /* 1010110101011101011011011010 */ #undef AUTH_ERROR #define AUTH_ERROR 0x1fc8d3ac /* 11111110010001101001110101100 */ /* * find_path()/set_cmnd() return values */ #define FOUND 0 #define NOT_FOUND 1 #define NOT_FOUND_DOT 2 #define NOT_FOUND_ERROR 3 #define NOT_FOUND_PATH 4 /* * Various modes sudo can be in (based on arguments) in hex */ #define MODE_RUN 0x00000001U #define MODE_EDIT 0x00000002U #define MODE_VALIDATE 0x00000004U #define MODE_INVALIDATE 0x00000008U #define MODE_VERSION 0x00000010U #define MODE_HELP 0x00000020U #define MODE_LIST 0x00000040U #define MODE_CHECK 0x00000080U #define MODE_ERROR 0x00000100U #define MODE_MASK 0x0000ffffU /* Mode flags */ #define MODE_ASKPASS 0x00010000U #define MODE_SHELL 0x00020000U #define MODE_LOGIN_SHELL 0x00040000U #define MODE_IMPLIED_SHELL 0x00080000U #define MODE_RESET_HOME 0x00100000U #define MODE_PRESERVE_GROUPS 0x00200000U #define MODE_PRESERVE_ENV 0x00400000U #define MODE_NONINTERACTIVE 0x00800000U #define MODE_IGNORE_TICKET 0x01000000U #define MODE_UPDATE_TICKET 0x02000000U #define MODE_POLICY_INTERCEPTED 0x04000000U /* Mode bits allowed for intercepted commands. */ #define MODE_INTERCEPT_MASK (MODE_RUN|MODE_NONINTERACTIVE|MODE_IGNORE_TICKET|MODE_POLICY_INTERCEPTED) /* * Used with set_perms() */ #define PERM_INITIAL 0x00 #define PERM_ROOT 0x01 #define PERM_USER 0x02 #define PERM_FULL_USER 0x03 #define PERM_SUDOERS 0x04 #define PERM_RUNAS 0x05 #define PERM_TIMESTAMP 0x06 #define PERM_IOLOG 0x07 /* Default sudoers uid/gid/mode if not set by the Makefile. */ #ifndef SUDOERS_UID # define SUDOERS_UID 0 #endif #ifndef SUDOERS_GID # define SUDOERS_GID 0 #endif #ifndef SUDOERS_MODE # define SUDOERS_MODE 0600 #endif struct sudo_lbuf; struct passwd; struct stat; struct timespec; /* * Function prototypes */ /* goodpath.c */ bool sudo_goodpath(const char *path, struct stat *sbp); /* findpath.c */ int find_path(const char *infile, char **outfile, struct stat *sbp, const char *path, bool ignore_dot, char * const *allowlist); /* resolve_cmnd.c */ int resolve_cmnd(struct sudoers_context *ctx, const char *infile, char **outfile, const char *path); /* check.c */ int check_user(struct sudoers_context *ctx, unsigned int validated, unsigned int mode); bool user_is_exempt(const struct sudoers_context *ctx); /* check_util.c */ int check_user_runchroot(const char *runchroot); int check_user_runcwd(const char *runcwd); /* prompt.c */ char *expand_prompt(const struct sudoers_context *ctx, const char *restrict old_prompt, const char *restrict auth_user); /* sudo_auth.c */ bool sudo_auth_needs_end_session(void); int verify_user(const struct sudoers_context *ctx, struct passwd *pw, char *prompt, unsigned int validated, struct sudo_conv_callback *callback); int sudo_auth_begin_session(const struct sudoers_context *ctx, struct passwd *pw, char **user_env[]); int sudo_auth_end_session(void); int sudo_auth_init(const struct sudoers_context *ctx, struct passwd *pw, unsigned int mode); int sudo_auth_approval(const struct sudoers_context *ctx, struct passwd *pw, unsigned int validated, bool exempt); int sudo_auth_cleanup(const struct sudoers_context *ctx, struct passwd *pw, bool force); /* set_perms.c */ bool rewind_perms(void); bool set_perms(const struct sudoers_context *, int); bool restore_perms(void); int pam_prep_user(struct passwd *); /* defaults.c */ void dump_defaults(void); void dump_auth_methods(void); /* getspwuid.c */ char *sudo_getepw(const struct passwd *); /* pwutil.c */ typedef struct cache_item * (*sudo_make_pwitem_t)(uid_t uid, const char *user); typedef struct cache_item * (*sudo_make_gritem_t)(gid_t gid, const char *group); typedef struct cache_item * (*sudo_make_gidlist_item_t)(const struct passwd *pw, int ngids, GETGROUPS_T *gids, char * const *gidstrs, unsigned int type); typedef struct cache_item * (*sudo_make_grlist_item_t)(const struct passwd *pw, char * const *groups); typedef bool (*sudo_valid_shell_t)(const char *shell); sudo_dso_public struct group *sudo_getgrgid(gid_t); sudo_dso_public struct group *sudo_getgrnam(const char *); sudo_dso_public void sudo_gr_addref(struct group *); sudo_dso_public void sudo_gr_delref(struct group *); bool user_in_group(const struct passwd *, const char *); struct group *sudo_fakegrnam(const char *); struct group *sudo_mkgrent(const char *group, gid_t gid, ...); struct gid_list *sudo_get_gidlist(const struct passwd *pw, unsigned int type); struct group_list *sudo_get_grlist(const struct passwd *pw); struct passwd *sudo_fakepwnam(const char *, gid_t); struct passwd *sudo_mkpwent(const char *user, uid_t uid, gid_t gid, const char *home, const char *shell); struct passwd *sudo_getpwnam(const char *); struct passwd *sudo_getpwuid(uid_t); void sudo_endspent(void); void sudo_freegrcache(void); void sudo_freepwcache(void); void sudo_gidlist_addref(struct gid_list *); void sudo_gidlist_delref(struct gid_list *); void sudo_grlist_addref(struct group_list *); void sudo_grlist_delref(struct group_list *); void sudo_pw_addref(struct passwd *); void sudo_pw_delref(struct passwd *); int sudo_set_gidlist(struct passwd *pw, int ngids, GETGROUPS_T *gids, char * const *gidstrs, unsigned int type); int sudo_set_grlist(struct passwd *pw, char * const *groups); int sudo_pwutil_get_max_groups(void); void sudo_pwutil_set_max_groups(int); 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); void sudo_setspent(void); bool user_shell_valid(const struct passwd *pw); /* timestr.c */ char *get_timestr(time_t, int); /* boottime.c */ bool get_boottime(struct timespec *); /* iolog.c */ bool cb_maxseq(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); bool cb_iolog_user(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); bool cb_iolog_group(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); bool cb_iolog_mode(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); /* iolog_path_escapes.c */ struct iolog_path_escape; extern const struct iolog_path_escape *sudoers_iolog_path_escapes; /* env.c */ char **env_get(void); bool env_merge(const struct sudoers_context *ctx, char * const envp[]); bool env_swap_old(void); void env_free(void); bool env_init(char * const envp[]); bool init_envtables(void); bool insert_env_vars(char * const envp[]); bool read_env_file(const struct sudoers_context *ctx, const char *path, bool overwrite, bool restricted); bool rebuild_env(const struct sudoers_context *ctx); bool validate_env_vars(const struct sudoers_context *ctx, char * const envp[]); int sudo_setenv(const char *var, const char *val, int overwrite); int sudo_unsetenv(const char *var); char *sudo_getenv(const char *name); char *sudo_getenv_nodebug(const char *name); int sudo_putenv_nodebug(char *str, bool dupcheck, bool overwrite); int sudo_unsetenv_nodebug(const char *var); int sudoers_hook_getenv(const char *name, char **value, void *closure); int sudoers_hook_putenv(char *string, void *closure); int sudoers_hook_setenv(const char *name, const char *value, int overwrite, void *closure); int sudoers_hook_unsetenv(const char *name, void *closure); void register_env_file(void * (*ef_open)(const char *), void (*ef_close)(void *), char * (*ef_next)(void *, int *), bool sys); /* env_pattern.c */ bool matches_env_pattern(const char *pattern, const char *var, bool *full_match); /* sudoers_cb.c */ void set_callbacks(void); bool cb_log_input(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); bool cb_log_output(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); /* sudoers.c */ FILE *open_sudoers(const char *, char **, bool, bool *); bool cb_runas_default(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); int set_cmnd_path(struct sudoers_context *ctx, const char *runchroot); void set_cmnd_status(struct sudoers_context *ctx, const char *runchroot); int sudoers_init(void *info, sudoers_logger_t logger, char * const envp[]); int sudoers_check_cmnd(int argc, char *const argv[], char *env_add[], void *closure); int sudoers_list(int argc, char *const argv[], const char *list_user, int verbose); int sudoers_validate_user(void); void sudoers_cleanup(void); bool sudoers_override_umask(void); const struct sudoers_context *sudoers_get_context(void); bool sudoers_set_mode(unsigned int flags, unsigned int mask); /* sudoers_ctx_free.c */ void sudoers_ctx_free(struct sudoers_context *ctx); /* policy.c */ unsigned int sudoers_policy_deserialize_info(struct sudoers_context *ctx, void *v, struct defaults_list *defaults); bool sudoers_policy_store_result(struct sudoers_context *ctx, bool accepted, char *argv[], char *envp[], mode_t cmnd_umask, char *iolog_path, void *v); bool sudoers_tty_present(struct sudoers_context *ctx); extern sudo_conv_t sudo_conv; extern sudo_printf_t sudo_printf; extern struct sudo_plugin_event * (*plugin_event_alloc)(void); /* group_plugin.c */ void group_plugin_unload(void); int group_plugin_query(const char *user, const char *group, const struct passwd *pwd); bool cb_group_plugin(struct sudoers_context *ctx, const char *file, int line, int column, const union sudo_defs_val *sd_un, int op); /* editor.c */ char *find_editor(int nfiles, char * const *files, int *argc_out, char ***argv_out, char * const *allowlist, const char **env_editor); /* exptilde.c */ bool expand_tilde(char **path, const char *user); /* gc.c */ enum sudoers_gc_types { GC_UNKNOWN, GC_VECTOR, GC_PTR }; bool sudoers_gc_add(enum sudoers_gc_types type, void *ptr); bool sudoers_gc_remove(enum sudoers_gc_types type, void *ptr); void sudoers_gc_init(void); void sudoers_gc_run(void); /* canon_path.c */ char *canon_path(const char *inpath); void canon_path_free(char *resolved); void canon_path_free_cache(void); /* strlcpy_unesc.c */ size_t strlcpy_unescape(char *restrict dst, const char *restrict src, size_t size); /* strvec_join.c */ char *strvec_join(char *const argv[], char sep, size_t (*cpy)(char *, const char *, size_t)); /* unesc_str.c */ void unescape_string(char *str); /* serialize_list.c */ char *serialize_list(const char *varname, struct list_members *members); /* sethost.c */ bool sudoers_sethost(struct sudoers_context *ctx, const char *host, const char *remhost); #endif /* SUDOERS_SUDOERS_H */