611 lines
15 KiB
C
611 lines
15 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (c) 1996, 1998-2005, 2007-2018
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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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/*
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* This is an open source non-commercial project. Dear PVS-Studio, please check it.
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* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
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*/
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#include <config.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_STRING_H
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# include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_STRINGS_H
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# include <strings.h>
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#endif /* HAVE_STRINGS_H */
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#include <unistd.h>
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#ifdef HAVE_NETGROUP_H
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# include <netgroup.h>
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#endif /* HAVE_NETGROUP_H */
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#include <time.h>
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#include <ctype.h>
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#include <errno.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include "tsgetgrpw.h"
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#include "sudoers.h"
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#include "interfaces.h"
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#include "sudo_conf.h"
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#include "sudo_lbuf.h"
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#include <gram.h>
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#ifndef YYDEBUG
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# define YYDEBUG 0
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#endif
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enum sudoers_formats {
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format_ldif,
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format_sudoers
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};
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/*
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* Function Prototypes
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*/
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static void dump_sudoers(struct sudo_lbuf *lbuf);
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static void usage(void) __attribute__((__noreturn__));
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static void set_runaspw(const char *);
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static void set_runasgr(const char *);
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static bool cb_runas_default(const union sudo_defs_val *);
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static int testsudoers_error(const char *msg);
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static int testsudoers_output(const char *buf);
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/* tsgetgrpw.c */
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extern void setgrfile(const char *);
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extern void setgrent(void);
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extern void endgrent(void);
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extern struct group *getgrent(void);
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extern struct group *getgrnam(const char *);
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extern struct group *getgrgid(gid_t);
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extern void setpwfile(const char *);
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extern void setpwent(void);
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extern void endpwent(void);
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extern struct passwd *getpwent(void);
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extern struct passwd *getpwnam(const char *);
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extern struct passwd *getpwuid(uid_t);
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/* gram.y */
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extern int (*trace_print)(const char *msg);
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/*
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* Globals
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*/
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struct sudo_user sudo_user;
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struct passwd *list_pw;
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static char *runas_group, *runas_user;
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#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
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extern char *malloc_options;
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#endif
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#if YYDEBUG
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extern int sudoersdebug;
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#endif
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__dso_public int main(int argc, char *argv[]);
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int
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main(int argc, char *argv[])
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{
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enum sudoers_formats input_format = format_sudoers;
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struct cmndspec *cs;
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struct privilege *priv;
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struct userspec *us;
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char *p, *grfile, *pwfile;
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const char *errstr;
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int match, host_match, runas_match, cmnd_match;
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int ch, dflag, exitcode = EXIT_FAILURE;
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struct sudo_lbuf lbuf;
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debug_decl(main, SUDOERS_DEBUG_MAIN);
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#if defined(SUDO_DEVEL) && defined(__OpenBSD__)
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malloc_options = "S";
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#endif
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#if YYDEBUG
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sudoersdebug = 1;
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#endif
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initprogname(argc > 0 ? argv[0] : "testsudoers");
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if (!sudoers_initlocale(setlocale(LC_ALL, ""), def_sudoers_locale))
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sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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sudo_warn_set_locale_func(sudoers_warn_setlocale);
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bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have own domain */
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textdomain("sudoers");
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/* No word wrap on output. */
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sudo_lbuf_init(&lbuf, testsudoers_output, 0, NULL, 0);
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/* Initialize the debug subsystem. */
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if (sudo_conf_read(NULL, SUDO_CONF_DEBUG) == -1)
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goto done;
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if (!sudoers_debug_register(getprogname(), sudo_conf_debug_files(getprogname())))
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goto done;
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dflag = 0;
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grfile = pwfile = NULL;
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while ((ch = getopt(argc, argv, "dg:G:h:i:P:p:tu:U:")) != -1) {
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switch (ch) {
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case 'd':
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dflag = 1;
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break;
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case 'G':
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sudoers_gid = (gid_t)sudo_strtoid(optarg, &errstr);
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if (errstr != NULL)
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sudo_fatalx("group-ID %s: %s", optarg, errstr);
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break;
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case 'g':
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runas_group = optarg;
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SET(sudo_user.flags, RUNAS_GROUP_SPECIFIED);
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break;
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case 'h':
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user_host = optarg;
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break;
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case 'i':
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if (strcasecmp(optarg, "ldif") == 0) {
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input_format = format_ldif;
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} else if (strcasecmp(optarg, "sudoers") == 0) {
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input_format = format_sudoers;
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} else {
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sudo_warnx(U_("unsupported input format %s"), optarg);
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usage();
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}
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break;
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case 'p':
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pwfile = optarg;
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break;
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case 'P':
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grfile = optarg;
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break;
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case 't':
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trace_print = testsudoers_error;
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break;
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case 'U':
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sudoers_uid = (uid_t)sudo_strtoid(optarg, &errstr);
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if (errstr != NULL)
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sudo_fatalx("user-ID %s: %s", optarg, errstr);
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break;
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case 'u':
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runas_user = optarg;
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SET(sudo_user.flags, RUNAS_USER_SPECIFIED);
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break;
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default:
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usage();
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break;
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}
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}
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argc -= optind;
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argv += optind;
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/* Set group/passwd file and init the cache. */
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if (grfile)
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setgrfile(grfile);
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if (pwfile)
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setpwfile(pwfile);
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if (argc < 2) {
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if (!dflag)
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usage();
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user_name = argc ? *argv++ : "root";
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user_cmnd = user_base = "true";
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argc = 0;
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} else {
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user_name = *argv++;
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user_cmnd = *argv++;
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if ((p = strrchr(user_cmnd, '/')) != NULL)
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user_base = p + 1;
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else
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user_base = user_cmnd;
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argc -= 2;
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}
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if ((sudo_user.pw = sudo_getpwnam(user_name)) == NULL)
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sudo_fatalx(U_("unknown user: %s"), user_name);
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if (user_host == NULL) {
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if ((user_host = sudo_gethostname()) == NULL)
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sudo_fatal("gethostname");
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}
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if ((p = strchr(user_host, '.'))) {
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*p = '\0';
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if ((user_shost = strdup(user_host)) == NULL)
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sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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*p = '.';
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} else {
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user_shost = user_host;
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}
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user_runhost = user_host;
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user_srunhost = user_shost;
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/* Fill in user_args from argv. */
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if (argc > 0) {
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char *to, **from;
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size_t size, n;
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for (size = 0, from = argv; *from; from++)
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size += strlen(*from) + 1;
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if ((user_args = malloc(size)) == NULL)
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sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
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for (to = user_args, from = argv; *from; from++) {
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n = strlcpy(to, *from, size - (to - user_args));
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if (n >= size - (to - user_args))
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sudo_fatalx(U_("internal error, %s overflow"), getprogname());
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to += n;
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*to++ = ' ';
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}
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*--to = '\0';
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}
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/* Initialize default values. */
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if (!init_defaults())
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sudo_fatalx(U_("unable to initialize sudoers default values"));
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/* Set group_plugin callback. */
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sudo_defs_table[I_GROUP_PLUGIN].callback = cb_group_plugin;
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/* Set runas callback. */
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sudo_defs_table[I_RUNAS_DEFAULT].callback = cb_runas_default;
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/* Set locale callback. */
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sudo_defs_table[I_SUDOERS_LOCALE].callback = sudoers_locale_callback;
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/* Load ip addr/mask for each interface. */
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if (get_net_ifs(&p) > 0) {
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if (!set_interfaces(p))
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sudo_fatal(U_("unable to parse network address list"));
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}
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/* Allocate space for data structures in the parser. */
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init_parser("sudoers", false, true);
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/*
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* Set runas passwd/group entries based on command line or sudoers.
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* Note that if runas_group was specified without runas_user we
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* run the command as the invoking user.
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*/
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if (runas_group != NULL) {
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set_runasgr(runas_group);
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set_runaspw(runas_user ? runas_user : user_name);
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} else
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set_runaspw(runas_user ? runas_user : def_runas_default);
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/* Parse the policy file. */
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sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, NULL);
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switch (input_format) {
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case format_ldif:
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if (!sudoers_parse_ldif(&parsed_policy, stdin, NULL, true))
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(void) printf("Parse error in LDIF");
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else
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(void) fputs("Parses OK", stdout);
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break;
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case format_sudoers:
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if (sudoersparse() != 0 || parse_error) {
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parse_error = true;
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if (errorlineno != -1)
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(void) printf("Parse error in %s near line %d",
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errorfile, errorlineno);
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else
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(void) printf("Parse error in %s", errorfile);
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} else {
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(void) fputs("Parses OK", stdout);
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}
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break;
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default:
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sudo_fatalx("error: unhandled input %d", input_format);
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}
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if (!update_defaults(&parsed_policy, NULL, SETDEF_ALL, false))
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(void) fputs(" (problem with defaults entries)", stdout);
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puts(".");
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if (dflag) {
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(void) putchar('\n');
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dump_sudoers(&lbuf);
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if (argc < 2) {
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exitcode = parse_error ? 1 : 0;
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goto done;
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}
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}
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/* This loop must match the one in sudo_file_lookup() */
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printf("\nEntries for user %s:\n", user_name);
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match = UNSPEC;
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TAILQ_FOREACH_REVERSE(us, &parsed_policy.userspecs, userspec_list, entries) {
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if (userlist_matches(&parsed_policy, sudo_user.pw, &us->users) != ALLOW)
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continue;
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TAILQ_FOREACH_REVERSE(priv, &us->privileges, privilege_list, entries) {
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sudo_lbuf_append(&lbuf, "\n");
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sudoers_format_privilege(&lbuf, &parsed_policy, priv, false);
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sudo_lbuf_print(&lbuf);
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host_match = hostlist_matches(&parsed_policy, sudo_user.pw,
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&priv->hostlist);
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if (host_match == ALLOW) {
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puts("\thost matched");
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TAILQ_FOREACH_REVERSE(cs, &priv->cmndlist, cmndspec_list, entries) {
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runas_match = runaslist_matches(&parsed_policy,
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cs->runasuserlist, cs->runasgrouplist, NULL, NULL);
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if (runas_match == ALLOW) {
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puts("\trunas matched");
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cmnd_match = cmnd_matches(&parsed_policy, cs->cmnd);
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if (cmnd_match != UNSPEC)
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match = cmnd_match;
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printf("\tcmnd %s\n", match == ALLOW ? "allowed" :
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match == DENY ? "denied" : "unmatched");
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}
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}
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} else
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puts(U_("\thost unmatched"));
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}
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}
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puts(match == ALLOW ? U_("\nCommand allowed") :
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match == DENY ? U_("\nCommand denied") : U_("\nCommand unmatched"));
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/*
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* Exit codes:
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* 0 - parsed OK and command matched.
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* 1 - parse error
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* 2 - command not matched
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* 3 - command denied
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*/
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exitcode = parse_error ? 1 : (match == ALLOW ? 0 : match + 3);
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done:
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sudo_lbuf_destroy(&lbuf);
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sudo_freepwcache();
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sudo_freegrcache();
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sudo_debug_exit_int(__func__, __FILE__, __LINE__, sudo_debug_subsys, exitcode);
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exit(exitcode);
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}
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static void
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set_runaspw(const char *user)
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{
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struct passwd *pw = NULL;
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debug_decl(set_runaspw, SUDOERS_DEBUG_UTIL);
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if (*user == '#') {
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const char *errstr;
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uid_t uid = sudo_strtoid(user + 1, &errstr);
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if (errstr == NULL) {
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if ((pw = sudo_getpwuid(uid)) == NULL)
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pw = sudo_fakepwnam(user, user_gid);
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}
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}
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if (pw == NULL) {
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if ((pw = sudo_getpwnam(user)) == NULL)
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sudo_fatalx(U_("unknown user: %s"), user);
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}
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if (runas_pw != NULL)
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sudo_pw_delref(runas_pw);
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runas_pw = pw;
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debug_return;
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}
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static void
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set_runasgr(const char *group)
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{
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struct group *gr = NULL;
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debug_decl(set_runasgr, SUDOERS_DEBUG_UTIL);
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if (*group == '#') {
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const char *errstr;
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gid_t gid = sudo_strtoid(group + 1, &errstr);
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if (errstr == NULL) {
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if ((gr = sudo_getgrgid(gid)) == NULL)
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gr = sudo_fakegrnam(group);
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}
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}
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if (gr == NULL) {
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if ((gr = sudo_getgrnam(group)) == NULL)
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sudo_fatalx(U_("unknown group: %s"), group);
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}
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if (runas_gr != NULL)
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sudo_gr_delref(runas_gr);
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runas_gr = gr;
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debug_return;
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}
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/*
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* Callback for runas_default sudoers setting.
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*/
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static bool
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cb_runas_default(const union sudo_defs_val *sd_un)
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{
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/* Only reset runaspw if user didn't specify one. */
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if (!runas_user && !runas_group)
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set_runaspw(sd_un->str);
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return true;
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}
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void
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sudo_setspent(void)
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{
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return;
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}
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void
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sudo_endspent(void)
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{
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return;
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}
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FILE *
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open_sudoers(const char *sudoers, bool doedit, bool *keepopen)
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{
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struct stat sb;
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FILE *fp = NULL;
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char *sudoers_base;
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debug_decl(open_sudoers, SUDOERS_DEBUG_UTIL);
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sudoers_base = strrchr(sudoers, '/');
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if (sudoers_base != NULL)
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sudoers_base++;
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switch (sudo_secure_file(sudoers, sudoers_uid, sudoers_gid, &sb)) {
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case SUDO_PATH_SECURE:
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fp = fopen(sudoers, "r");
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break;
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case SUDO_PATH_MISSING:
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sudo_warn("unable to stat %s", sudoers_base);
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break;
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case SUDO_PATH_BAD_TYPE:
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sudo_warnx("%s is not a regular file", sudoers_base);
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break;
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case SUDO_PATH_WRONG_OWNER:
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sudo_warnx("%s should be owned by uid %u",
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sudoers_base, (unsigned int) sudoers_uid);
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break;
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case SUDO_PATH_WORLD_WRITABLE:
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sudo_warnx("%s is world writable", sudoers_base);
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break;
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case SUDO_PATH_GROUP_WRITABLE:
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sudo_warnx("%s should be owned by gid %u",
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sudoers_base, (unsigned int) sudoers_gid);
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break;
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default:
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/* NOTREACHED */
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break;
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}
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debug_return_ptr(fp);
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}
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bool
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init_envtables(void)
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{
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return(true);
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}
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bool
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set_perms(int perm)
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{
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return true;
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}
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bool
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restore_perms(void)
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{
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return true;
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}
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static bool
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print_defaults(struct sudo_lbuf *lbuf)
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{
|
|
struct defaults *def, *next;
|
|
debug_decl(print_defaults, SUDOERS_DEBUG_UTIL);
|
|
|
|
TAILQ_FOREACH_SAFE(def, &parsed_policy.defaults, entries, next)
|
|
sudoers_format_default_line(lbuf, &parsed_policy, def, &next, false);
|
|
|
|
debug_return_bool(!sudo_lbuf_error(lbuf));
|
|
}
|
|
|
|
static int
|
|
print_alias(struct sudoers_parse_tree *parse_tree, struct alias *a, void *v)
|
|
{
|
|
struct sudo_lbuf *lbuf = v;
|
|
struct member *m;
|
|
debug_decl(print_alias, SUDOERS_DEBUG_UTIL);
|
|
|
|
sudo_lbuf_append(lbuf, "%s %s = ", alias_type_to_string(a->type),
|
|
a->name);
|
|
TAILQ_FOREACH(m, &a->members, entries) {
|
|
if (m != TAILQ_FIRST(&a->members))
|
|
sudo_lbuf_append(lbuf, ", ");
|
|
sudoers_format_member(lbuf, parse_tree, m, NULL, UNSPEC);
|
|
}
|
|
sudo_lbuf_append(lbuf, "\n");
|
|
|
|
debug_return_int(sudo_lbuf_error(lbuf) ? -1 : 0);
|
|
}
|
|
|
|
static bool
|
|
print_aliases(struct sudo_lbuf *lbuf)
|
|
{
|
|
debug_decl(print_aliases, SUDOERS_DEBUG_UTIL);
|
|
|
|
alias_apply(&parsed_policy, print_alias, lbuf);
|
|
|
|
debug_return_bool(!sudo_lbuf_error(lbuf));
|
|
}
|
|
|
|
static void
|
|
dump_sudoers(struct sudo_lbuf *lbuf)
|
|
{
|
|
debug_decl(dump_sudoers, SUDOERS_DEBUG_UTIL);
|
|
|
|
/* Print Defaults */
|
|
if (!print_defaults(lbuf))
|
|
goto done;
|
|
if (lbuf->len > 0) {
|
|
sudo_lbuf_print(lbuf);
|
|
sudo_lbuf_append(lbuf, "\n");
|
|
}
|
|
|
|
/* Print Aliases */
|
|
if (!print_aliases(lbuf))
|
|
goto done;
|
|
if (lbuf->len > 1) {
|
|
sudo_lbuf_print(lbuf);
|
|
sudo_lbuf_append(lbuf, "\n");
|
|
}
|
|
|
|
/* Print User_Specs */
|
|
if (!sudoers_format_userspecs(lbuf, &parsed_policy, NULL, false, true))
|
|
goto done;
|
|
if (lbuf->len > 1) {
|
|
sudo_lbuf_print(lbuf);
|
|
}
|
|
|
|
done:
|
|
if (sudo_lbuf_error(lbuf)) {
|
|
if (errno == ENOMEM)
|
|
sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
|
|
}
|
|
|
|
debug_return;
|
|
}
|
|
|
|
static int
|
|
testsudoers_output(const char *buf)
|
|
{
|
|
return fputs(buf, stdout);
|
|
}
|
|
|
|
static int
|
|
testsudoers_error(const char *buf)
|
|
{
|
|
return fputs(buf, stderr);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-i input_format] [-P grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname());
|
|
exit(EXIT_FAILURE);
|
|
}
|