/* * Copyright (c) 1993-1996, 1998-2010 Todd C. Miller * * 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. * * For a brief history of sudo, please see the HISTORY file included * with this distribution. */ #define _SUDO_MAIN #ifdef __TANDEM # include #endif #include #include #include #include #include #ifdef HAVE_SETRLIMIT # include # include #endif #include #ifdef STDC_HEADERS # include # include #else # ifdef HAVE_STDLIB_H # include # endif #endif /* STDC_HEADERS */ #ifdef HAVE_STRING_H # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS) # include # endif # include #else # ifdef HAVE_STRINGS_H # include # endif #endif /* HAVE_STRING_H */ #ifdef HAVE_UNISTD_H # include #endif /* HAVE_UNISTD_H */ #include #include #include #include #include #if TIME_WITH_SYS_TIME # include #endif #ifdef HAVE_SETLOCALE # include #endif #include #include #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS) # ifdef __hpux # undef MAXINT # include # else # include # endif /* __hpux */ # include #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */ #ifdef HAVE_LOGIN_CAP_H # include # ifndef LOGIN_DEFROOTCLASS # define LOGIN_DEFROOTCLASS "daemon" # endif #endif #ifdef HAVE_PROJECT_H # include # include #endif #ifdef HAVE_SELINUX # include #endif #ifdef HAVE_MBR_CHECK_MEMBERSHIP # include #endif #include #include "sudo_plugin.h" #include "sudoers.h" #include "lbuf.h" #include "interfaces.h" #include "auth/sudo_auth.h" #ifdef USING_NONUNIX_GROUPS # include "nonunix.h" #endif /* * Prototypes */ static void init_vars(char * const *); static int set_cmnd(int); static void set_loginclass(struct passwd *); static void set_project(struct passwd *); static void set_runasgr(char *); static void set_runaspw(char *); static int sudoers_policy_version(int verbose); static struct passwd *get_authpw(void); static int deserialize_info(char * const settings[], char * const user_info[]); extern int sudo_edit(int, char **, char **); extern int rebuild_env(int, int); extern int env_init(char * const envp[]); void validate_env_vars(struct list_member *); void insert_env_vars(struct list_member *); /* XXX */ char *fmt_string(const char *, const char *); /* * Globals */ char *prev_user; struct sudo_user sudo_user; struct passwd *auth_pw, *list_pw; struct interface *interfaces; int num_interfaces; int long_list; int debug_level; uid_t timestamp_uid; extern int errorlineno; extern int parse_error; extern char *errorfile; #ifdef HAVE_LOGIN_CAP_H login_cap_t *lc; #endif /* HAVE_LOGIN_CAP_H */ #ifdef HAVE_BSD_AUTH_H char *login_style; #endif /* HAVE_BSD_AUTH_H */ sigaction_t saved_sa_int, saved_sa_quit, saved_sa_tstp; sudo_conv_t sudo_conv; static char *runas_user; static char *runas_group; static struct sudo_nss_list *snl; static int NewArgc; static char **NewArgv; /* XXX */ extern char **environ; /* error.c */ extern sigjmp_buf error_jmp; static int sudo_mode; static char * const * user_env; static int sudoers_policy_open(unsigned int version, sudo_conv_t conversation, char * const settings[], char * const user_info[], char * const envp[]) { int sources = 0; sigaction_t sa; struct sudo_nss *nss; /* Must be done before we do any password lookups */ #if defined(HAVE_GETPRPWNAM) && defined(HAVE_SET_AUTH_PARAMETERS) (void) set_auth_parameters(Argc, Argv); # ifdef HAVE_INITPRIVS initprivs(); # endif #endif /* HAVE_GETPRPWNAM && HAVE_SET_AUTH_PARAMETERS */ sudo_conv = conversation; /* XXX, stash elsewhere? */ if (sigsetjmp(error_jmp, 1)) { /* called via error(), errorx() or log_error() */ return -1; } /* XXX - signal setup duplicated in sudo.c */ /* * Signal setup: * Ignore keyboard-generated signals so the user cannot interrupt * us at some point and avoid the logging. * Install handler to wait for children when they exit. */ zero_bytes(&sa, sizeof(sa)); sigemptyset(&sa.sa_mask); sa.sa_flags = SA_RESTART; sa.sa_handler = SIG_IGN; (void) sigaction(SIGINT, &sa, &saved_sa_int); (void) sigaction(SIGQUIT, &sa, &saved_sa_quit); (void) sigaction(SIGTSTP, &sa, &saved_sa_tstp); sudo_setpwent(); sudo_setgrent(); /* Setup defaults data structures. */ init_defaults(); /* Load the list of local ip addresses and netmasks. */ load_interfaces(); /* Parse settings and user_info */ sudo_mode = deserialize_info(settings, user_info); init_vars(envp); /* XXX - move this later? */ #ifdef USING_NONUNIX_GROUPS sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */ #endif /* USING_NONUNIX_GROUPS */ /* Parse nsswitch.conf for sudoers order. */ snl = sudo_read_nss(); /* Open and parse sudoers, set global defaults */ tq_foreach_fwd(snl, nss) { if (nss->open(nss) == 0 && nss->parse(nss) == 0) { sources++; nss->setdefs(nss); } } if (sources == 0) { warningx("no valid sudoers sources found, quitting"); return -1; } /* XXX - collect post-sudoers parse settings into a function */ /* * Set runas passwd/group entries based on command line or sudoers. * Note that if runas_group was specified without runas_user we * defer setting runas_pw so the match routines know to ignore it. */ if (runas_group != NULL) { set_runasgr(runas_group); if (runas_user != NULL) set_runaspw(runas_user); } else set_runaspw(runas_user ? runas_user : def_runas_default); if (!update_defaults(SETDEF_RUNAS)) log_error(NO_STDERR|NO_EXIT, "problem with defaults entries"); /* Set login class if applicable. */ set_loginclass(sudo_user.pw); /* XXX */ user_env = envp; /* stash for later */ return TRUE; } static void sudoers_policy_close(int exit_status, int error) { /* XXX - fill in */ return; } static int sudoers_policy_main(int argc, char * const argv[], char *env_add[], char **command_infop[], char **argv_out[], char **user_env_out[]) { static char *command_info[32]; /* XXX */ struct sudo_nss *nss; char **old_environ = environ; int cmnd_status = -1, fd, validated, pwflag = 0; int info_len = 0; int rval = FALSE; /* refactor so list can use it too */ /* Is root even allowed to run sudo? */ if (user_uid == 0 && !def_root_sudo) { warningx("sudoers specifies that root is not allowed to sudo"); goto done; } if (sigsetjmp(error_jmp, 1)) { /* error recovery via error(), errorx() or log_error() */ return -1; } /* * Make a local copy of argc/argv, with special handling * for the '-e', '-i' or '-s' options. * XXX - handle sudoedit */ NewArgv = emalloc2(argc + 1, sizeof(char *)); memcpy(NewArgv, argv, argc * sizeof(char *)); NewArgv[argc] = NULL; NewArgc = argc; if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) NewArgv[0] = runas_pw->pw_shell; /* Set environ to contents of user_env. */ env_init(user_env); #ifdef USING_NONUNIX_GROUPS sudo_nonunix_groupcheck_init(); /* initialise nonunix groups impl */ #endif /* USING_NONUNIX_GROUPS */ /* Find command in path */ cmnd_status = set_cmnd(sudo_mode); if (cmnd_status == -1) { rval = -1; goto done; } #ifdef HAVE_SETLOCALE if (!setlocale(LC_ALL, def_sudoers_locale)) { warningx("unable to set locale to \"%s\", using \"C\"", def_sudoers_locale); setlocale(LC_ALL, "C"); } #endif /* * Check sudoers sources. */ validated = FLAG_NO_USER | FLAG_NO_HOST; tq_foreach_fwd(snl, nss) { validated = nss->lookup(nss, validated, pwflag); if (ISSET(validated, VALIDATE_OK)) { /* Handle "= auth" in netsvc.conf */ if (nss->ret_if_found) break; } else { /* Handle [NOTFOUND=return] */ if (nss->ret_if_notfound) break; } } #ifdef USING_NONUNIX_GROUPS /* Finished with the groupcheck code */ sudo_nonunix_groupcheck_cleanup(); #endif if (safe_cmnd == NULL) safe_cmnd = estrdup(user_cmnd); #ifdef HAVE_SETLOCALE setlocale(LC_ALL, ""); #endif /* If only a group was specified, set runas_pw based on invoking user. */ if (runas_pw == NULL) set_runaspw(user_name); /* * Look up the timestamp dir owner if one is specified. */ if (def_timestampowner) { struct passwd *pw; if (*def_timestampowner == '#') pw = sudo_getpwuid(atoi(def_timestampowner + 1)); else pw = sudo_getpwnam(def_timestampowner); if (!pw) log_error(0, "timestamp owner (%s): No such user", def_timestampowner); timestamp_uid = pw->pw_uid; } /* If given the -P option, set the "preserve_groups" flag. */ if (ISSET(sudo_mode, MODE_PRESERVE_GROUPS)) def_preserve_groups = TRUE; /* If no command line args and "shell_noargs" is not set, error out. */ if (ISSET(sudo_mode, MODE_IMPLIED_SHELL) && !def_shell_noargs) { rval = -2; /* usage error */ goto done; } /* Bail if a tty is required and we don't have one. */ if (def_requiretty) { if ((fd = open(_PATH_TTY, O_RDWR|O_NOCTTY)) == -1) { //audit_failure(NewArgv, "no tty"); warningx("sorry, you must have a tty to run sudo"); goto done; } else (void) close(fd); } /* User may have overridden environment resetting via the -E flag. */ if (ISSET(sudo_mode, MODE_PRESERVE_ENV) && def_setenv) def_env_reset = FALSE; /* Build a new environment that avoids any nasty bits. */ rebuild_env(sudo_mode, def_noexec); /* Fill in passwd struct based on user we are authenticating as. */ auth_pw = get_authpw(); /* Require a password if sudoers says so. */ if (def_authenticate) { rval = check_user(validated, sudo_mode); if (rval != TRUE) goto done; } /* If run as root with SUDO_USER set, set sudo_user.pw to that user. */ /* XXX - causes confusion when root is not listed in sudoers */ if (sudo_mode & (MODE_RUN | MODE_EDIT) && prev_user != NULL) { if (user_uid == 0 && strcmp(prev_user, "root") != 0) { struct passwd *pw; if ((pw = sudo_getpwnam(prev_user)) != NULL) { sudo_user.pw = pw; #ifdef HAVE_MBR_CHECK_MEMBERSHIP mbr_uid_to_uuid(user_uid, user_uuid); #endif } } } if (!ISSET(validated, VALIDATE_OK)) { /* XXX - error message */ goto done; } /* Finally tell the user if the command did not exist. */ if (cmnd_status == NOT_FOUND_DOT) { //audit_failure(NewArgv, "command in current directory"); warningx("ignoring `%s' found in '.'\nUse `sudo ./%s' if this is the `%s' you wish to run.", user_cmnd, user_cmnd, user_cmnd); goto done; } else if (cmnd_status == NOT_FOUND) { //audit_failure(NewArgv, "%s: command not found", user_cmnd); warningx("%s: command not found", user_cmnd); goto done; } /* If user specified env vars make sure sudoers allows it. */ if (ISSET(sudo_mode, MODE_RUN) && !def_setenv) { if (ISSET(sudo_mode, MODE_PRESERVE_ENV)) { warningx("sorry, you are not allowed to preserve the environment"); goto done; } else validate_env_vars(sudo_user.env_vars); } log_allowed(validated); if (ISSET(sudo_mode, MODE_CHECK)) rval = display_cmnd(snl, list_pw ? list_pw : sudo_user.pw); else if (ISSET(sudo_mode, MODE_LIST)) display_privs(snl, list_pw ? list_pw : sudo_user.pw); /* XXX - return val */ /* Cleanup sudoers sources */ tq_foreach_fwd(snl, nss) { nss->close(nss); } if (ISSET(sudo_mode, (MODE_VALIDATE|MODE_CHECK|MODE_LIST))) goto done; /* * Set umask based on sudoers. * If user's umask is more restrictive, OR in those bits too * unless umask_override is set. */ if (def_umask != 0777) { mode_t mask = def_umask; if (!def_umask_override) { mode_t omask = umask(mask); mask |= omask; umask(omask); } easprintf(&command_info[info_len++], "umask=0%o", mask); } if (ISSET(sudo_mode, MODE_LOGIN_SHELL)) { char *p; /* Convert /bin/sh -> -sh so shell knows it is a login shell */ if ((p = strrchr(NewArgv[0], '/')) == NULL) p = NewArgv[0]; *p = '-'; NewArgv[0] = p; /* Set cwd to run user's homedir. */ command_info[info_len++] = fmt_string("cwd", runas_pw->pw_dir); #if defined(__linux__) || defined(_AIX) /* Insert system-wide environment variables. */ /* XXX */ read_env_file(_PATH_ENVIRONMENT, TRUE); #endif } /* Insert system-wide environment variables. */ #if 0 /* XXX - add back */ if (def_env_file) { read_env_file(def_env_file, FALSE); } /* Insert user-specified environment variables. */ insert_env_vars(sudo_user.env_vars); #endif /* Restore signal handlers before we exec. */ (void) sigaction(SIGINT, &saved_sa_int, NULL); (void) sigaction(SIGQUIT, &saved_sa_quit, NULL); (void) sigaction(SIGTSTP, &saved_sa_tstp, NULL); /* Close the password and group files and free up memory. */ sudo_endpwent(); sudo_endgrent(); command_info[info_len++] = fmt_string("command", safe_cmnd); if (def_stay_setuid) { easprintf(&command_info[info_len++], "runas_uid=%u", user_uid); easprintf(&command_info[info_len++], "runas_gid=%u", user_gid); easprintf(&command_info[info_len++], "runas_euid=%u", runas_pw->pw_uid); easprintf(&command_info[info_len++], "runas_egid=%u", runas_pw->pw_gid); } else { easprintf(&command_info[info_len++], "runas_uid=%u", runas_pw->pw_uid); easprintf(&command_info[info_len++], "runas_gid=%u", runas_pw->pw_gid); } if (def_preserve_groups) { command_info[info_len++], "preserve_groups=true"; } else { /* XXX - what about when runas user has no passwd entry? */ #ifdef HAVE_GETGRSET char *gid_list = getgrset(runas_pw->pw_name); easprintf(&command_info[info_len++], "groups=%s", gid_list); efree(gid_list); #else gid_t groups[NGROUPS_MAX * 2]; /* should use sysconf */ int i, len, ngroups = NGROUPS_MAX * 2; size_t glsize; char *cp, *gid_list; /* XXX - rval */ getgrouplist(runas_pw->pw_name, runas_pw->pw_gid, groups, &ngroups); glsize = sizeof("groups=") - 1 + (user_ngroups * (MAX_UID_T_LEN + 1)); gid_list = emalloc(glsize); memcpy(gid_list, "groups=", sizeof("groups=") - 1); cp = gid_list + sizeof("groups=") - 1; for (i = 0; i < ngroups; i++) { /* XXX - check rval */ len = snprintf(cp, glsize - (cp - gid_list), "%s%lu", i ? "," : "", (unsigned long)groups[i]); cp += len; } command_info[info_len++] = gid_list; #endif } /* Must audit before uid change. */ //audit_success(NewArgv); /* XXX */ *command_infop = command_info; *argv_out = NewArgv; *user_env_out = environ; /* actually our local copy */ rval = TRUE; done: environ = old_environ; return rval; } static int sudoers_policy_check(int argc, char * const argv[], char *env_add[], char **command_infop[], char **argv_out[], char **user_env_out[]) { SET(sudo_mode, MODE_RUN); return sudoers_policy_main(argc, argv, env_add, command_infop, argv_out, user_env_out); } static int sudoers_policy_validate(void) { user_cmnd = "validate"; SET(sudo_mode, MODE_VALIDATE); return sudoers_policy_main(0, NULL, NULL, NULL, NULL, NULL); } static void sudoers_policy_invalidate(int remove) { user_cmnd = "kill"; if (sigsetjmp(error_jmp, 1) == 0) { remove_timestamp(remove); cleanup(0); } } static int sudoers_policy_list(int argc, char * const argv[], int verbose, const char *list_user) { user_cmnd = "list"; if (argc) SET(sudo_mode, MODE_CHECK); else SET(sudo_mode, MODE_LIST); if (verbose) long_list = 1; if (list_user) { list_pw = sudo_getpwnam(list_user); warningx("unknown user: %s", optarg); return -1; } return sudoers_policy_main(argc, argv, NULL, NULL, NULL, NULL); } /* * Initialize timezone, set umask, fill in ``sudo_user'' struct and * load the ``interfaces'' array. */ static void init_vars(char * const envp[]) { char * const * ep; #if 0 /* Sanity check command from user. */ if (user_cmnd == NULL && strlen(NewArgv[0]) >= PATH_MAX) errorx(1, "%s: File name too long", NewArgv[0]); #endif #ifdef HAVE_TZSET (void) tzset(); /* set the timezone if applicable */ #endif /* HAVE_TZSET */ for (ep = envp; *ep; ep++) { /* XXX - don't fill in if empty string */ switch (**ep) { case 'D': if (strncmp("DISPLAY=", *ep, 8) == 0) user_display = *ep + 8; break; case 'K': if (strncmp("KRB5CCNAME=", *ep, 11) == 0) user_ccname = *ep + 11; break; case 'P': if (strncmp("PATH=", *ep, 5) == 0) user_path = *ep + 5; break; case 'S': if (!user_prompt && strncmp("SUDO_PROMPT=", *ep, 12) == 0) user_prompt = *ep + 12; else if (strncmp("SUDO_USER=", *ep, 10) == 0) prev_user = *ep + 10; else if (strncmp("SUDO_ASKPASS=", *ep, 13) == 0) user_askpass = *ep + 13; break; } } /* * Get a local copy of the user's struct passwd with the shadow password * if necessary. It is assumed that euid is 0 at this point so we * can read the shadow passwd file if necessary. */ if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL) { struct passwd pw; /* Create a fake struct passwd for log_error(). */ memset(&pw, 0, sizeof(pw)); pw.pw_uid = getuid(); pw.pw_name = user_name; sudo_user.pw = &pw; /* * It is not unusual for users to place "sudo -k" in a .logout * file which can cause sudo to be run during reboot after the * YP/NIS/NIS+/LDAP/etc daemon has died. */ if (sudo_mode == MODE_KILL || sudo_mode == MODE_INVALIDATE) errorx(1, "unknown user: %s", user_name); log_error(0, "unknown user: %s", user_name); /* NOTREACHED */ } #ifdef HAVE_MBR_CHECK_MEMBERSHIP mbr_uid_to_uuid(user_uid, user_uuid); #endif /* It is now safe to use log_error() and set_perms() */ if (def_fqdn) { /* may call log_error() */ set_fqdn(); } } /* * Fill in user_cmnd, user_args, user_base and user_stat variables * and apply any command-specific defaults entries. */ static int set_cmnd(sudo_mode) int sudo_mode; { int rval; /* Set project if applicable. */ set_project(runas_pw); /* Resolve the path and return. */ rval = FOUND; user_stat = emalloc(sizeof(struct stat)); /* Default value for cmnd, overridden below. */ if (user_cmnd == NULL) user_cmnd = NewArgv[0]; if (sudo_mode & (MODE_RUN | MODE_EDIT | MODE_CHECK)) { if (ISSET(sudo_mode, MODE_RUN | MODE_CHECK)) { set_perms(PERM_RUNAS); rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path); set_perms(PERM_ROOT); if (rval != FOUND) { /* Failed as root, try as invoking user. */ set_perms(PERM_USER); rval = find_path(NewArgv[0], &user_cmnd, user_stat, user_path); set_perms(PERM_ROOT); } } /* set user_args */ if (NewArgc > 1) { char *to, **from; size_t size, n; /* Alloc and build up user_args. */ for (size = 0, from = NewArgv + 1; *from; from++) size += strlen(*from) + 1; user_args = emalloc(size); for (to = user_args, from = NewArgv + 1; *from; from++) { n = strlcpy(to, *from, size - (to - user_args)); if (n >= size - (to - user_args)) errorx(1, "internal error, init_vars() overflow"); to += n; *to++ = ' '; } *--to = '\0'; } } if ((user_base = strrchr(user_cmnd, '/')) != NULL) user_base++; else user_base = user_cmnd; if (!update_defaults(SETDEF_CMND)) log_error(NO_STDERR|NO_EXIT, "problem with defaults entries"); if (!runas_user && !runas_group) set_runaspw(def_runas_default); /* may have been updated above */ return(rval); } /* * Open sudoers and sanity check mode/owner/type. * Returns a handle to the sudoers file or NULL on error. */ FILE * open_sudoers(sudoers, doedit, keepopen) const char *sudoers; int doedit; int *keepopen; { struct stat statbuf; FILE *fp = NULL; int rootstat; /* * Fix the mode and group on sudoers file from old default. * Only works if file system is readable/writable by root. */ if ((rootstat = stat_sudoers(sudoers, &statbuf)) == 0 && SUDOERS_UID == statbuf.st_uid && SUDOERS_MODE != 0400 && (statbuf.st_mode & 0007777) == 0400) { if (chmod(sudoers, SUDOERS_MODE) == 0) { warningx("fixed mode on %s", sudoers); SET(statbuf.st_mode, SUDOERS_MODE); if (statbuf.st_gid != SUDOERS_GID) { if (chown(sudoers, (uid_t) -1, SUDOERS_GID) == 0) { warningx("set group on %s", sudoers); statbuf.st_gid = SUDOERS_GID; } else warning("unable to set group on %s", sudoers); } } else warning("unable to fix mode on %s", sudoers); } /* * Sanity checks on sudoers file. Must be done as sudoers * file owner. We already did a stat as root, so use that * data if we can't stat as sudoers file owner. */ set_perms(PERM_SUDOERS); if (rootstat != 0 && stat_sudoers(sudoers, &statbuf) != 0) log_error(USE_ERRNO|NO_EXIT, "can't stat %s", sudoers); else if (!S_ISREG(statbuf.st_mode)) log_error(NO_EXIT, "%s is not a regular file", sudoers); else if ((statbuf.st_mode & 07777) != SUDOERS_MODE) log_error(NO_EXIT, "%s is mode 0%o, should be 0%o", sudoers, (unsigned int) (statbuf.st_mode & 07777), (unsigned int) SUDOERS_MODE); else if (statbuf.st_uid != SUDOERS_UID) log_error(NO_EXIT, "%s is owned by uid %lu, should be %lu", sudoers, (unsigned long) statbuf.st_uid, (unsigned long) SUDOERS_UID); else if (statbuf.st_gid != SUDOERS_GID) log_error(NO_EXIT, "%s is owned by gid %lu, should be %lu", sudoers, (unsigned long) statbuf.st_gid, (unsigned long) SUDOERS_GID); else if ((fp = fopen(sudoers, "r")) == NULL) log_error(USE_ERRNO|NO_EXIT, "can't open %s", sudoers); else { /* * Make sure we can actually read sudoers so we can present the * user with a reasonable error message (unlike the lexer). */ if (statbuf.st_size != 0 && fgetc(fp) == EOF) { log_error(USE_ERRNO|NO_EXIT, "can't read %s", sudoers); fclose(fp); fp = NULL; } } if (fp != NULL) { rewind(fp); (void) fcntl(fileno(fp), F_SETFD, 1); } set_perms(PERM_ROOT); /* change back to root */ return(fp); } #ifdef HAVE_LOGIN_CAP_H static void set_loginclass(pw) struct passwd *pw; { int errflags; /* * Don't make it a fatal error if the user didn't specify the login * class themselves. We do this because if login.conf gets * corrupted we want the admin to be able to use sudo to fix it. */ if (login_class) errflags = NO_MAIL|MSG_ONLY; else errflags = NO_MAIL|MSG_ONLY|NO_EXIT; if (login_class && strcmp(login_class, "-") != 0) { if (user_uid != 0 && strcmp(runas_user ? runas_user : def_runas_default, "root") != 0) errorx(1, "only root can use -c %s", login_class); } else { login_class = pw->pw_class; if (!login_class || !*login_class) login_class = (pw->pw_uid == 0) ? LOGIN_DEFROOTCLASS : LOGIN_DEFCLASS; } lc = login_getclass(login_class); if (!lc || !lc->lc_class || strcmp(lc->lc_class, login_class) != 0) { log_error(errflags, "unknown login class: %s", login_class); if (!lc) lc = login_getclass(NULL); /* needed for login_getstyle() later */ } } #else static void set_loginclass(pw) struct passwd *pw; { } #endif /* HAVE_LOGIN_CAP_H */ #ifdef HAVE_PROJECT_H static void set_project(pw) struct passwd *pw; { int errflags = NO_MAIL|MSG_ONLY|NO_EXIT; int errval; struct project proj; struct project *resultp = '\0'; char buf[1024]; /* * Collect the default project for the user and settaskid */ setprojent(); if (resultp = getdefaultproj(pw->pw_name, &proj, buf, sizeof(buf))) { errval = setproject(resultp->pj_name, pw->pw_name, TASK_NORMAL); if (errval != 0) { switch(errval) { case SETPROJ_ERR_TASK: if (errno == EAGAIN) log_error(errflags, "resource control limit has been reached"); else if (errno == ESRCH) log_error(errflags, "user \"%s\" is not a member of " "project \"%s\"", pw->pw_name, resultp->pj_name); else if (errno == EACCES) log_error(errflags, "the invoking task is final"); else log_error(errflags, "could not join project \"%s\"", resultp->pj_name); break; case SETPROJ_ERR_POOL: if (errno == EACCES) log_error(errflags, "no resource pool accepting " "default bindings exists for project \"%s\"", resultp->pj_name); else if (errno == ESRCH) log_error(errflags, "specified resource pool does " "not exist for project \"%s\"", resultp->pj_name); else log_error(errflags, "could not bind to default " "resource pool for project \"%s\"", resultp->pj_name); break; default: if (errval <= 0) { log_error(errflags, "setproject failed for project \"%s\"", resultp->pj_name); } else { log_error(errflags, "warning, resource control assignment " "failed for project \"%s\"", resultp->pj_name); } } } } else { log_error(errflags, "getdefaultproj() error: %s", strerror(errno)); } endprojent(); } #else static void set_project(pw) struct passwd *pw; { } #endif /* HAVE_PROJECT_H */ /* * Look up the fully qualified domain name and set user_host and user_shost. */ void set_fqdn(void) { #ifdef HAVE_GETADDRINFO struct addrinfo *res0, hint; #else struct hostent *hp; #endif char *p; #ifdef HAVE_GETADDRINFO zero_bytes(&hint, sizeof(hint)); hint.ai_family = PF_UNSPEC; hint.ai_flags = AI_CANONNAME; if (getaddrinfo(user_host, NULL, &hint, &res0) != 0) { #else if (!(hp = gethostbyname(user_host))) { #endif log_error(MSG_ONLY|NO_EXIT, "unable to resolve host %s", user_host); } else { if (user_shost != user_host) efree(user_shost); efree(user_host); #ifdef HAVE_GETADDRINFO user_host = estrdup(res0->ai_canonname); freeaddrinfo(res0); #else user_host = estrdup(hp->h_name); #endif } if ((p = strchr(user_host, '.')) != NULL) user_shost = estrndup(user_host, (size_t)(p - user_host)); else user_shost = user_host; } /* * Get passwd entry for the user we are going to run commands as. * By default, this is "root". Updates runas_pw as a side effect. */ static void set_runaspw(user) char *user; { if (*user == '#') { if ((runas_pw = sudo_getpwuid(atoi(user + 1))) == NULL) runas_pw = sudo_fakepwnam(user, runas_gr ? runas_gr->gr_gid : 0); } else { if ((runas_pw = sudo_getpwnam(user)) == NULL) { //audit_failure(NewArgv, "unknown user: %s", user); log_error(NO_MAIL|MSG_ONLY, "unknown user: %s", user); } } } /* * Get group entry for the group we are going to run commands as. * Updates runas_pw as a side effect. */ static void set_runasgr(group) char *group; { if (*group == '#') { if ((runas_gr = sudo_getgrgid(atoi(group + 1))) == NULL) runas_gr = sudo_fakegrnam(group); } else { if ((runas_gr = sudo_getgrnam(group)) == NULL) log_error(NO_MAIL|MSG_ONLY, "unknown group: %s", group); } } /* * Get passwd entry for the user we are going to authenticate as. * By default, this is the user invoking sudo. In the most common * case, this matches sudo_user.pw or runas_pw. */ static struct passwd * get_authpw() { struct passwd *pw; if (def_rootpw) { if ((pw = sudo_getpwuid(0)) == NULL) log_error(0, "unknown uid: 0"); } else if (def_runaspw) { if ((pw = sudo_getpwnam(def_runas_default)) == NULL) log_error(0, "unknown user: %s", def_runas_default); } else if (def_targetpw) { if (runas_pw->pw_name == NULL) log_error(NO_MAIL|MSG_ONLY, "unknown uid: %lu", (unsigned long) runas_pw->pw_uid); pw = runas_pw; } else pw = sudo_user.pw; return(pw); } /* * Cleanup hook for error()/errorx() */ void cleanup(gotsignal) int gotsignal; { struct sudo_nss *nss; if (!gotsignal) { if (snl != NULL) { tq_foreach_fwd(snl, nss) nss->close(nss); } sudo_endpwent(); sudo_endgrent(); } #ifdef notyet /* XXX */ if (def_transcript) term_restore(STDIN_FILENO, 0); #endif } static int sudoers_policy_version(int verbose) { struct sudo_conv_message msg; struct sudo_conv_reply repl; char *str; easprintf(&str, "Sudoers plugin version %s\n", PACKAGE_VERSION); /* Call conversation function */ memset(&msg, 0, sizeof(msg)); msg.msg_type = SUDO_CONV_INFO_MSG; msg.msg = str; memset(&repl, 0, sizeof(repl)); sudo_conv(1, &msg, &repl); #ifdef notyet if (verbose) { putchar('\n'); (void) printf("Sudoers path: %s\n", _PATH_SUDOERS); #ifdef HAVE_LDAP # ifdef _PATH_NSSWITCH_CONF (void) printf("nsswitch path: %s\n", _PATH_NSSWITCH_CONF); # endif (void) printf("ldap.conf path: %s\n", _PATH_LDAP_CONF); (void) printf("ldap.secret path: %s\n", _PATH_LDAP_SECRET); #endif dump_auth_methods(); dump_defaults(); dump_interfaces(); } #endif return TRUE; } static int deserialize_info(char * const settings[], char * const user_info[]) { char * const *cur; const char *p; int flags = 0; #define MATCHES(s, v) (strncmp(s, v, sizeof(v) - 1) == 0) /* Parse command line settings. */ for (cur = settings; *cur != NULL; cur++) { if (MATCHES(*cur, "debug_level=")) { debug_level = atoi(*cur + sizeof("debug_level=") - 1); continue; } if (MATCHES(*cur, "runas_user=")) { runas_user = *cur + sizeof("runas_user=") - 1; continue; } if (MATCHES(*cur, "runas_group=")) { runas_group = *cur + sizeof("runas_group=") - 1; continue; } if (MATCHES(*cur, "prompt=")) { user_prompt = *cur + sizeof("prompt=") - 1; def_passprompt_override = TRUE; continue; } if (MATCHES(*cur, "set_home=")) { if (atobool(*cur + sizeof("set_home=") - 1) == TRUE) SET(flags, MODE_RESET_HOME); continue; } if (MATCHES(*cur, "preserve_environment=")) { if (atobool(*cur + sizeof("preserve_environment=") - 1) == TRUE) SET(flags, MODE_PRESERVE_ENV); continue; } if (MATCHES(*cur, "login_shell=")) { if (atobool(*cur + sizeof("login_shell=") - 1) == TRUE) { SET(flags, MODE_LOGIN_SHELL); def_env_reset = TRUE; } continue; } if (MATCHES(*cur, "implied_shell=")) { if (atobool(*cur + sizeof("implied_shell=") - 1) == TRUE) SET(flags, MODE_IMPLIED_SHELL); continue; } if (MATCHES(*cur, "preserve_groups=")) { if (atobool(*cur + sizeof("preserve_groups=") - 1) == TRUE) SET(flags, MODE_PRESERVE_GROUPS); continue; } if (MATCHES(*cur, "ignore_ticket=")) { if (atobool(*cur + sizeof("ignore_ticket=") - 1) == TRUE) SET(flags, MODE_IGNORE_TICKET); continue; } if (MATCHES(*cur, "login_class=")) { login_class = *cur + sizeof("login_class=") - 1; def_use_loginclass = TRUE; continue; } #ifdef HAVE_SELINUX if (MATCHES(*cur, "selinux_role=")) { user_role = *cur + sizeof("selinux_role=") - 1; continue; } if (MATCHES(*cur, "selinux_type=")) { user_role = *cur + sizeof("selinux_type=") - 1; continue; } #endif /* HAVE_SELINUX */ #ifdef HAVE_BSD_AUTH_H if (MATCHES(*cur, "bsdauth_type=")) { login_style = *cur + sizeof("bsdauth_type=") - 1; continue; } #endif /* HAVE_BSD_AUTH_H */ #if !defined(HAVE_GETPROGNAME) && !defined(HAVE___PROGNAME) if (MATCHES(*cur, "progname=")) { setprogname(*cur + sizeof("progname=") - 1); continue; } #endif } for (cur = user_info; *cur != NULL; cur++) { if (MATCHES(*cur, "user=")) { user_name = estrdup(*cur + sizeof("user=") - 1); continue; } if (MATCHES(*cur, "uid=")) { user_uid = atoi(*cur + sizeof("uid=") - 1); continue; } if (MATCHES(*cur, "gid=")) { user_gid = atoi(*cur + sizeof("gid=") - 1); continue; } if (MATCHES(*cur, "groups=")) { /* Count number of groups */ const char *val = *cur + sizeof("groups=") - 1; const char *cp; for (cp = val; *cp != '\0'; cp++) { if (*cp == ',') user_ngroups++; } if (user_ngroups) { user_groups = emalloc2(user_ngroups, sizeof(gid_t)); user_ngroups = 0; cp = val; for (;;) { /* XXX - strtol would be better here */ user_groups[user_ngroups++] = atoi(cp); cp = strchr(cp, ','); if (cp == NULL) break; cp++; /* skip over comma */ } } continue; } if (MATCHES(*cur, "cwd=")) { user_cwd = estrdup(*cur + sizeof("cwd=") - 1); continue; } if (MATCHES(*cur, "tty=")) { user_tty = user_ttypath = estrdup(*cur + sizeof("tty=") - 1); if (strncmp(user_tty, _PATH_DEV, sizeof(_PATH_DEV) - 1) == 0) user_tty += sizeof(_PATH_DEV) - 1; continue; } if (MATCHES(*cur, "host=")) { user_host = user_shost = estrdup(*cur + sizeof("host=") - 1); if ((p = strchr(user_host, '.'))) user_shost = estrndup(user_host, (size_t)(p - user_host)); continue; } if (MATCHES(*cur, "lines=")) { sudo_user.lines = atoi(*cur + sizeof("lines=") - 1); continue; } if (MATCHES(*cur, "cols=")) { sudo_user.cols = atoi(*cur + sizeof("cols=") - 1); continue; } } #undef MATCHES return flags; } struct policy_plugin sudoers_policy = { SUDO_POLICY_PLUGIN, SUDO_API_VERSION, sudoers_policy_open, sudoers_policy_close, sudoers_policy_version, sudoers_policy_check, sudoers_policy_list, sudoers_policy_validate, sudoers_policy_invalidate }; #ifdef notyet struct io_plugin sudoers_io = { SUDO_IO_PLUGIN, SUDO_API_VERSION, io_open, io_close, io_version, io_log_input, io_log_output }; #endif