487 lines
10 KiB
C
487 lines
10 KiB
C
/*
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* Copyright (c) 1996, 1998-2004 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/param.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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#else
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# ifdef HAVE_STRINGS_H
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# include <strings.h>
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# endif
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#endif /* HAVE_STRING_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_FNMATCH
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# include <fnmatch.h>
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#endif /* HAVE_FNMATCH */
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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 <pwd.h>
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#include <grp.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "sudo.h"
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#include "interfaces.h"
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#include "parse.h"
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#include "gram.h"
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#ifndef HAVE_FNMATCH
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# include "emul/fnmatch.h"
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#endif /* HAVE_FNMATCH */
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#ifndef lint
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static const char rcsid[] = "$Sudo$";
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#endif /* lint */
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/*
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* Globals
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*/
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int Argc, NewArgc;
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char **Argv, **NewArgv;
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int num_interfaces;
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struct interface *interfaces;
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struct sudo_user sudo_user;
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extern int parse_error;
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/* For getopt(3) */
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extern char *optarg;
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extern int optind;
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extern struct defaults *defaults;
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extern struct userspec *userspecs;
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int print_alias __P((VOID *, VOID *));
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void dump_sudoers __P((void));
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void print_defaults __P((void));
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void print_privilege __P((struct privilege *));
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void print_userspecs __P((void));
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void usage __P((void)) __attribute__((__noreturn__));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct cmndspec *cs;
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struct passwd pw, rpw;
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struct privilege *priv;
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struct userspec *us;
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char *p, hbuf[MAXHOSTNAMELEN];
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int ch, dflag, rval, matched;
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#ifdef YYDEBUG
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extern int yydebug;
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yydebug = 1;
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#endif
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Argv = argv;
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Argc = argc;
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memset(&pw, 0, sizeof(pw));
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sudo_user.pw = &pw;
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memset(&rpw, 0, sizeof(rpw));
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runas_pw = &rpw;
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dflag = 0;
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while ((ch = getopt(argc, argv, "dh: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 'u':
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user_runas = &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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NewArgc = argc;
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NewArgv = argv;
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if (argc < 2) {
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if (!dflag)
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usage();
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user_name = "nobody";
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user_cmnd = user_base = "true";
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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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NewArgc -= 2;
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}
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if (user_host == NULL) {
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if (gethostname(hbuf, sizeof(hbuf)) != 0)
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error(1, "gethostname");
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user_host = hbuf;
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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 = 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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/* Fill in user_args from NewArgv. */
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if (NewArgc > 1) {
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char *to, **from;
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size_t size, n;
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size = (size_t) (NewArgv[NewArgc-1] - NewArgv[1]) +
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strlen(NewArgv[NewArgc-1]) + 1;
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user_args = (char *) emalloc(size);
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for (to = user_args, from = NewArgv + 1; *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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errorx(1, "internal error, init_vars() overflow");
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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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runas_pw->pw_name = *user_runas;
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/* Load ip addr/mask for each interface. */
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load_interfaces();
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/* Allocate space for data structures in the parser. */
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init_parser("sudoers", 0);
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if (yyparse() != 0 || parse_error)
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(void) fputs("Does not parse", stdout);
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else
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(void) fputs("Parses OK", stdout);
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if (!update_defaults())
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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();
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if (argc < 2)
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exit(0);
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}
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/* This loop must match the one in sudoers_lookup() */
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printf("\nEntries for user %s:\n", user_name);
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matched = UNSPEC;
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for (us = userspecs; us != NULL; us = us->next) {
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if (user_matches(sudo_user.pw, us->user) == TRUE) {
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priv = us->privileges;
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putchar('\n');
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print_privilege(priv);
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putchar('\n');
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if (host_matches(user_shost, user_host, priv->hostlist) == TRUE) {
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puts("\thost matched");
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for (cs = priv->cmndlist; cs != NULL; cs = cs->next) {
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if (runas_matches(runas_pw, cs->runaslist) == TRUE) {
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puts("\trunas matched");
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rval = cmnd_matches(user_cmnd, user_args, cs->cmnd);
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if (rval != UNSPEC)
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matched = rval;
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printf("\tcommand %s\n", rval == ALLOW ? "allowed" :
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rval == DENY ? "denied" : "unmatched");
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}
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}
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}
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}
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}
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printf("\nCommand %s\n", matched == TRUE ? "allowed" :
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matched == FALSE ? "denied" : "unmatched");
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exit(0);
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}
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void
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set_fqdn()
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{
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return;
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}
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int
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set_runaspw(user)
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char *user;
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{
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return(TRUE);
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}
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FILE *
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open_sudoers(path, keepopen)
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const char *path;
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int *keepopen;
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{
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return(fopen(path, "r"));
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}
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void
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init_envtables()
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{
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return;
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}
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void
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set_perms(perm)
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int perm;
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{
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return;
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}
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struct passwd *
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sudo_getpwuid(uid)
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uid_t uid;
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{
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return(getpwuid(uid));
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}
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struct passwd *
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sudo_getpwnam(name)
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const char *name;
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{
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return(getpwnam(name));
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}
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struct group *
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sudo_getgrgid(gid)
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gid_t gid;
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{
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return(getgrgid(gid));
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}
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struct group *
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sudo_getgrnam(name)
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const char *name;
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{
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return(getgrnam(name));
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}
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void
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cleanup()
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{
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return;
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}
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void
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print_member(m)
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struct member *m;
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{
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struct sudo_command *c;
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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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}
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void
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print_defaults()
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{
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struct defaults *d;
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struct member *m;
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for (d = defaults; d != NULL; d = d->next) {
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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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}
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for (m = d->binding; m != NULL; m = m->next) {
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if (m->type == COMMAND)
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printf("%s\"%s %s\"", m != d->binding ? "," : "",
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((struct sudo_command *)m->name)->cmnd,
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((struct sudo_command *)m->name)->args);
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else
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printf("%s%s", m != d->binding ? "," : "", m->name);
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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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}
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int
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print_alias(v1, v2)
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VOID *v1, *v2;
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{
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struct alias *a = (struct alias *)v1;
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struct member *m;
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struct sudo_command *c;
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switch (a->type) {
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case HOSTALIAS:
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(void) printf("Host_Alias\t%s = ", a->name);
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break;
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case CMNDALIAS:
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(void) printf("Cmnd_Alias\t%s = ", a->name);
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break;
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case USERALIAS:
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(void) printf("User_Alias\t%s = ", a->name);
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break;
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case RUNASALIAS:
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(void) printf("Runas_Alias\t%s = ", a->name);
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break;
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}
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for (m = a->first_member; m != NULL; m = m->next) {
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if (m != a->first_member)
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fputs(", ", stdout);
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if (m->type == COMMAND) {
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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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} else
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fputs(m->name, stdout);
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}
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putchar('\n');
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return(0);
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}
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void
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print_privilege(priv)
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struct privilege *priv;
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{
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struct cmndspec *cs;
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struct member *m;
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struct privilege *p;
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struct cmndtag tags;
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for (p = priv; p != NULL; p = p->next) {
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if (p != priv)
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fputs(" : ", stdout);
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for (m = p->hostlist; m != NULL; m = m->next) {
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if (m != p->hostlist)
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fputs(", ", stdout);
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print_member(m);
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}
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fputs(" = ", stdout);
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tags.nopasswd = tags.noexec = tags.monitor = UNSPEC;
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for (cs = p->cmndlist; cs != NULL; cs = cs->next) {
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if (cs != p->cmndlist)
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fputs(", ", stdout);
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if (cs->runaslist) {
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fputs("(", stdout);
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for (m = cs->runaslist; m != NULL; m = m->next) {
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if (m != cs->runaslist)
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fputs(", ", stdout);
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print_member(m);
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}
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fputs(") ", stdout);
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}
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if (cs->tags.nopasswd != UNSPEC && cs->tags.nopasswd != tags.nopasswd)
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printf("%sPASSWD: ", cs->tags.nopasswd ? "NO" : "");
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if (cs->tags.noexec != UNSPEC && cs->tags.noexec != tags.noexec)
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printf("%sEXEC: ", cs->tags.noexec ? "NO" : "");
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if (cs->tags.monitor != UNSPEC && cs->tags.monitor != tags.monitor)
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printf("%sMONITOR: ", cs->tags.monitor ? "" : "NO");
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print_member(cs->cmnd);
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memcpy(&tags, &cs->tags, sizeof(tags));
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}
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}
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}
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void
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print_userspecs()
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{
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struct member *m;
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struct userspec *us;
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for (us = userspecs; us != NULL; us = us->next) {
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for (m = us->user; m != NULL; m = m->next) {
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if (m != us->user)
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fputs(", ", stdout);
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print_member(m);
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}
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putchar('\t');
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print_privilege(us->privileges);
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putchar('\n');
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}
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}
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void
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dump_sudoers()
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{
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print_defaults();
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putchar('\n');
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alias_apply(print_alias, NULL);
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putchar('\n');
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print_userspecs();
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}
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void
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usage()
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{
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(void) fprintf(stderr,
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"usage: %s [-h host] [-u user] <user> <command> [args]\n",
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getprogname());
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exit(1);
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}
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