712 lines
17 KiB
C
712 lines
17 KiB
C
/*
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* Copyright (c) 1996, 1998-2005, 2007-2015
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* Todd C. Miller <Todd.Miller@courtesan.com>
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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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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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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#define SUDO_MAIN
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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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#ifdef STDC_HEADERS
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# include <stdlib.h>
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# include <stddef.h>
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#else
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# ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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# endif
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#endif /* STDC_HEADERS */
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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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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_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 <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 "parse.h"
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#include "sudo_conf.h"
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#include <gram.h>
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#ifdef HAVE_FNMATCH
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# include <fnmatch.h>
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#else
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# include "compat/fnmatch.h"
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#endif /* HAVE_FNMATCH */
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#ifndef YYDEBUG
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# define YYDEBUG 0
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#endif
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/*
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* Function Prototypes
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*/
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int print_alias(void *, void *);
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void dump_sudoers(void);
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void print_defaults(void);
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void print_privilege(struct privilege *);
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void print_userspecs(void);
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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 char *);
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static int testsudoers_print(const char *msg);
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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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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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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 = 0;
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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 = "AFGJPR";
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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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sudoers_initlocale(setlocale(LC_ALL, ""), def_sudoers_locale);
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bindtextdomain("sudoers", LOCALEDIR); /* XXX - should have own domain */
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textdomain("sudoers");
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/* Initialize the debug subsystem. */
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sudo_conf_read(NULL, SUDO_CONF_DEBUG);
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sudoers_debug_register(getprogname(), sudo_conf_debug_files(getprogname()));
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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: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 'h':
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user_host = optarg;
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break;
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case 'G':
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sudoers_gid = (gid_t)sudo_strtoid(optarg, NULL, NULL, &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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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_print;
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break;
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case 'U':
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sudoers_uid = (uid_t)sudo_strtoid(optarg, NULL, NULL, &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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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 (sudo_setpwent() == -1 || sudo_setgrent() == -1)
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sudo_fatalx(U_("unable to allocate memory"));
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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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user_shost = sudo_estrdup(user_host);
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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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user_args = sudo_emalloc(size);
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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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init_defaults();
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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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/* Load ip addr/mask for each interface. */
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if (get_net_ifs(&p) > 0)
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set_interfaces(p);
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/* Allocate space for data structures in the parser. */
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init_parser("sudoers", false);
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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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if (!update_defaults(SETDEF_ALL))
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(void) fputs(" (problem with defaults entries)", stdout);
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puts(".");
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if (def_group_plugin && group_plugin_load(def_group_plugin) != true)
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def_group_plugin = NULL;
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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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* defer setting runas_pw so the match routines know to ignore it.
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*/
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if (runas_group != NULL) {
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set_runasgr(runas_group);
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if (runas_user != NULL)
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set_runaspw(runas_user);
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} else
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set_runaspw(runas_user ? runas_user : def_runas_default);
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if (dflag) {
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(void) putchar('\n');
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dump_sudoers();
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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, &userspecs, userspec_list, entries) {
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if (userlist_matches(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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putchar('\n');
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print_privilege(priv);
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putchar('\n');
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host_match = hostlist_matches(&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(cs->runasuserlist,
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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(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(_("\thost unmatched"));
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}
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}
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puts(match == ALLOW ? _("\nCommand allowed") :
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match == DENY ? _("\nCommand denied") : _("\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_endpwent();
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sudo_endgrent();
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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, NULL, NULL, &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, NULL, NULL, &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 char *user)
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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(user);
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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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void
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init_envtables(void)
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{
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return;
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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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void
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print_member(struct member *m)
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{
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struct sudo_command *c;
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debug_decl(print_member, SUDOERS_DEBUG_UTIL)
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if (m->negated)
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putchar('!');
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if (m->name == NULL)
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fputs("ALL", stdout);
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else if (m->type != COMMAND)
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fputs(m->name, stdout);
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else {
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c = (struct sudo_command *) m->name;
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printf("%s%s%s", c->cmnd, c->args ? " " : "",
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c->args ? c->args : "");
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}
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debug_return;
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}
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void
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print_defaults(void)
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{
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struct defaults *d;
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struct member *m;
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debug_decl(print_defaults, SUDOERS_DEBUG_UTIL)
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TAILQ_FOREACH(d, &defaults, entries) {
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(void) fputs("Defaults", stdout);
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switch (d->type) {
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case DEFAULTS_HOST:
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putchar('@');
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break;
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case DEFAULTS_USER:
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putchar(':');
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break;
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case DEFAULTS_RUNAS:
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putchar('>');
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break;
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case DEFAULTS_CMND:
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putchar('!');
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break;
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}
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TAILQ_FOREACH(m, d->binding, entries) {
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if (m != TAILQ_FIRST(d->binding))
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putchar(',');
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print_member(m);
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}
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printf("\t%s%s", d->op == false ? "!" : "", d->var);
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if (d->val != NULL) {
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printf("%c%s", d->op == true ? '=' : d->op, d->val);
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}
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putchar('\n');
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}
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|
|
|
debug_return;
|
|
}
|
|
|
|
int
|
|
print_alias(void *v1, void *v2)
|
|
{
|
|
struct alias *a = (struct alias *)v1;
|
|
struct member *m;
|
|
struct sudo_command *c;
|
|
debug_decl(print_alias, SUDOERS_DEBUG_UTIL)
|
|
|
|
switch (a->type) {
|
|
case HOSTALIAS:
|
|
(void) printf("Host_Alias\t%s = ", a->name);
|
|
break;
|
|
case CMNDALIAS:
|
|
(void) printf("Cmnd_Alias\t%s = ", a->name);
|
|
break;
|
|
case USERALIAS:
|
|
(void) printf("User_Alias\t%s = ", a->name);
|
|
break;
|
|
case RUNASALIAS:
|
|
(void) printf("Runas_Alias\t%s = ", a->name);
|
|
break;
|
|
}
|
|
TAILQ_FOREACH(m, &a->members, entries) {
|
|
if (m != TAILQ_FIRST(&a->members))
|
|
fputs(", ", stdout);
|
|
if (m->type == COMMAND) {
|
|
c = (struct sudo_command *) m->name;
|
|
printf("%s%s%s", c->cmnd, c->args ? " " : "",
|
|
c->args ? c->args : "");
|
|
} else if (m->type == ALL) {
|
|
fputs("ALL", stdout);
|
|
} else {
|
|
fputs(m->name, stdout);
|
|
}
|
|
}
|
|
putchar('\n');
|
|
debug_return_int(0);
|
|
}
|
|
|
|
#define TAG_SET(tt) \
|
|
((tt) != UNSPEC && (tt) != IMPLIED)
|
|
|
|
#define TAG_CHANGED(t) \
|
|
(TAG_SET(cs->tags.t) && cs->tags.t != tags.t)
|
|
|
|
void
|
|
print_privilege(struct privilege *priv)
|
|
{
|
|
struct cmndspec *cs;
|
|
struct member *m;
|
|
struct cmndtag tags;
|
|
debug_decl(print_privilege, SUDOERS_DEBUG_UTIL)
|
|
|
|
TAILQ_FOREACH(m, &priv->hostlist, entries) {
|
|
if (m != TAILQ_FIRST(&priv->hostlist))
|
|
fputs(", ", stdout);
|
|
print_member(m);
|
|
}
|
|
fputs(" = ", stdout);
|
|
tags.log_input = UNSPEC;
|
|
tags.log_output = UNSPEC;
|
|
tags.noexec = UNSPEC;
|
|
tags.nopasswd = UNSPEC;
|
|
tags.send_mail = UNSPEC;
|
|
tags.setenv = UNSPEC;
|
|
TAILQ_FOREACH(cs, &priv->cmndlist, entries) {
|
|
if (cs != TAILQ_FIRST(&priv->cmndlist))
|
|
fputs(", ", stdout);
|
|
if (cs->runasuserlist != NULL || cs->runasgrouplist != NULL) {
|
|
fputs("(", stdout);
|
|
if (cs->runasuserlist != NULL) {
|
|
TAILQ_FOREACH(m, cs->runasuserlist, entries) {
|
|
if (m != TAILQ_FIRST(cs->runasuserlist))
|
|
fputs(", ", stdout);
|
|
print_member(m);
|
|
}
|
|
} else if (cs->runasgrouplist == NULL) {
|
|
fputs(def_runas_default, stdout);
|
|
} else {
|
|
fputs(sudo_user.pw->pw_name, stdout);
|
|
}
|
|
if (cs->runasgrouplist != NULL) {
|
|
fputs(" : ", stdout);
|
|
TAILQ_FOREACH(m, cs->runasgrouplist, entries) {
|
|
if (m != TAILQ_FIRST(cs->runasgrouplist))
|
|
fputs(", ", stdout);
|
|
print_member(m);
|
|
}
|
|
}
|
|
fputs(") ", stdout);
|
|
}
|
|
#ifdef HAVE_SELINUX
|
|
if (cs->role)
|
|
printf("ROLE=%s ", cs->role);
|
|
if (cs->type)
|
|
printf("TYPE=%s ", cs->type);
|
|
#endif /* HAVE_SELINUX */
|
|
#ifdef HAVE_PRIV_SET
|
|
if (cs->privs)
|
|
printf("PRIVS=%s ", cs->privs);
|
|
if (cs->limitprivs)
|
|
printf("LIMITPRIVS=%s ", cs->limitprivs);
|
|
#endif /* HAVE_PRIV_SET */
|
|
if (TAG_CHANGED(log_input))
|
|
printf("%sLOG_INPUT: ", cs->tags.log_input ? "" : "NO");
|
|
if (TAG_CHANGED(log_output))
|
|
printf("%sLOG_OUTPUT: ", cs->tags.log_output ? "" : "NO");
|
|
if (TAG_CHANGED(noexec))
|
|
printf("%sEXEC: ", cs->tags.noexec ? "NO" : "");
|
|
if (TAG_CHANGED(nopasswd))
|
|
printf("%sPASSWD: ", cs->tags.nopasswd ? "NO" : "");
|
|
if (TAG_CHANGED(send_mail))
|
|
printf("%sMAIL: ", cs->tags.send_mail ? "" : "NO");
|
|
if (TAG_CHANGED(setenv))
|
|
printf("%sSETENV: ", cs->tags.setenv ? "" : "NO");
|
|
print_member(cs->cmnd);
|
|
memcpy(&tags, &cs->tags, sizeof(tags));
|
|
}
|
|
debug_return;
|
|
}
|
|
|
|
void
|
|
print_userspecs(void)
|
|
{
|
|
struct member *m;
|
|
struct userspec *us;
|
|
struct privilege *priv;
|
|
debug_decl(print_userspecs, SUDOERS_DEBUG_UTIL)
|
|
|
|
TAILQ_FOREACH(us, &userspecs, entries) {
|
|
TAILQ_FOREACH(m, &us->users, entries) {
|
|
if (m != TAILQ_FIRST(&us->users))
|
|
fputs(", ", stdout);
|
|
print_member(m);
|
|
}
|
|
putchar('\t');
|
|
TAILQ_FOREACH(priv, &us->privileges, entries) {
|
|
if (priv != TAILQ_FIRST(&us->privileges))
|
|
fputs(" : ", stdout);
|
|
print_privilege(priv);
|
|
}
|
|
putchar('\n');
|
|
}
|
|
debug_return;
|
|
}
|
|
|
|
void
|
|
dump_sudoers(void)
|
|
{
|
|
debug_decl(dump_sudoers, SUDOERS_DEBUG_UTIL)
|
|
|
|
print_defaults();
|
|
|
|
putchar('\n');
|
|
alias_apply(print_alias, NULL);
|
|
|
|
putchar('\n');
|
|
print_userspecs();
|
|
|
|
debug_return;
|
|
}
|
|
|
|
static int testsudoers_print(const char *msg)
|
|
{
|
|
return fputs(msg, stderr);
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
(void) fprintf(stderr, "usage: %s [-dt] [-G sudoers_gid] [-g group] [-h host] [-P grfile] [-p pwfile] [-U sudoers_uid] [-u user] <user> <command> [args]\n", getprogname());
|
|
exit(1);
|
|
}
|