コード例 #1
0
/*
 * check_grp_file - check the content of the group file
 */
static void check_grp_file (int *errors, bool *changed)
{
	struct commonio_entry *gre, *tgre;
	struct group *grp;
#ifdef SHADOWGRP
	struct sgrp *sgr;
#endif

	/*
	 * Loop through the entire group file.
	 */
	for (gre = __gr_get_head (); NULL != gre; gre = gre->next) {
		/*
		 * Skip all NIS entries.
		 */

		if ((gre->line[0] == '+') || (gre->line[0] == '-')) {
			continue;
		}

		/*
		 * Start with the entries that are completely corrupt. They
		 * have no (struct group) entry because they couldn't be
		 * parsed properly.
		 */
		if (NULL == gre->eptr) {

			/*
			 * Tell the user this entire line is bogus and ask
			 * them to delete it.
			 */
			(void) puts (_("invalid group file entry"));
			printf (_("delete line '%s'? "), gre->line);
			*errors += 1;

			/*
			 * prompt the user to delete the entry or not
			 */
			if (!yes_or_no (read_only)) {
				continue;
			}

			/*
			 * All group file deletions wind up here. This code
			 * removes the current entry from the linked list.
			 * When done, it skips back to the top of the loop
			 * to try out the next list element.
			 */
		      delete_gr:
			SYSLOG ((LOG_INFO, "delete group line '%s'",
			         gre->line));
			*changed = true;

			__gr_del_entry (gre);
			continue;
		}

		/*
		 * Group structure is good, start using it.
		 */
		grp = gre->eptr;

		/*
		 * Make sure this entry has a unique name.
		 */
		for (tgre = __gr_get_head (); NULL != tgre; tgre = tgre->next) {

			const struct group *ent = tgre->eptr;

			/*
			 * Don't check this entry
			 */
			if (tgre == gre) {
				continue;
			}

			/*
			 * Don't check invalid entries.
			 */
			if (NULL == ent) {
				continue;
			}

			if (strcmp (grp->gr_name, ent->gr_name) != 0) {
				continue;
			}

			/*
			 * Tell the user this entry is a duplicate of
			 * another and ask them to delete it.
			 */
			(void) puts (_("duplicate group entry"));
			printf (_("delete line '%s'? "), gre->line);
			*errors += 1;

			/*
			 * prompt the user to delete the entry or not
			 */
			if (yes_or_no (read_only)) {
				goto delete_gr;
			}
		}

		/*
		 * Check for invalid group names.  --marekm
		 */
		if (!is_valid_group_name (grp->gr_name)) {
			*errors += 1;
			printf (_("invalid group name '%s'\n"), grp->gr_name);
		}

		/*
		 * Check for invalid group ID.
		 */
		if (grp->gr_gid == (gid_t)-1) {
			printf (_("invalid group ID '%lu'\n"), (long unsigned int)grp->gr_gid);
			*errors += 1;
		}

		/*
		 * Workaround for a NYS libc 5.3.12 bug on RedHat 4.2 -
		 * groups with no members are returned as groups with one
		 * member "", causing grpck to fail.  --marekm
		 */
		if (   (NULL != grp->gr_mem[0])
		    && (NULL == grp->gr_mem[1])
		    && ('\0' == grp->gr_mem[0][0])) {
			grp->gr_mem[0] = NULL;
		}

		if (check_members (grp->gr_name, grp->gr_mem,
		                   _("group %s: no user %s\n"),
		                   _("delete member '%s'? "),
		                   "delete member '%s' from group '%s'",
		                   errors) == 1) {
			*changed = true;
			gre->changed = true;
			__gr_set_changed ();
		}

#ifdef	SHADOWGRP
		/*
		 * Make sure this entry exists in the /etc/gshadow file.
		 */

		if (is_shadow) {
			sgr = (struct sgrp *) sgr_locate (grp->gr_name);
			if (sgr == NULL) {
				printf (_("no matching group file entry in %s\n"),
				        sgr_file);
				printf (_("add group '%s' in %s? "),
				        grp->gr_name, sgr_file);
				*errors += 1;
				if (yes_or_no (read_only)) {
					struct sgrp sg;
					struct group gr;
					static char *empty = NULL;

					sg.sg_name = grp->gr_name;
					sg.sg_passwd = grp->gr_passwd;
					sg.sg_adm = ∅
					sg.sg_mem = grp->gr_mem;
					SYSLOG ((LOG_INFO,
					         "add group '%s' to '%s'",
					         grp->gr_name, sgr_file));
					*changed = true;

					if (sgr_update (&sg) == 0) {
						fprintf (stderr,
						         _("%s: failed to prepare the new %s entry '%s'\n"),
						         Prog, sgr_dbname (), sg.sg_name);
						fail_exit (E_CANT_UPDATE);
					}
					/* remove password from /etc/group */
					gr = *grp;
					gr.gr_passwd = SHADOW_PASSWD_STRING;	/* XXX warning: const */
					if (gr_update (&gr) == 0) {
						fprintf (stderr,
						         _("%s: failed to prepare the new %s entry '%s'\n"),
						         Prog, gr_dbname (), gr.gr_name);
						fail_exit (E_CANT_UPDATE);
					}
				}
			} else {
				/**
				 * Verify that all the members defined in /etc/group are also
				 * present in /etc/gshadow.
				 */
				compare_members_lists (grp->gr_name,
				                       grp->gr_mem, sgr->sg_mem,
				                       grp_file, sgr_file);

				/* The group entry has a gshadow counterpart.
				 * Make sure no passwords are in group.
				 */
				if (strcmp (grp->gr_passwd, SHADOW_PASSWD_STRING) != 0) {
					printf (_("group %s has an entry in %s, but its password field in %s is not set to 'x'\n"),
					        grp->gr_name, sgr_file, grp_file);
					*errors += 1;
				}
			}
		}
#endif

	}
}
コード例 #2
0
ファイル: grpck.c プロジェクト: OPSF/uClinux
/*
 * grpck - verify group file integrity
 */
int main (int argc, char **argv)
{
    int arg;
    int errors = 0;
    int deleted = 0;
    int i;
    struct commonio_entry *gre, *tgre;
    struct group *grp;
    int sort_mode = 0;

#ifdef	SHADOWGRP
    struct commonio_entry *sge, *tsge;
    struct sgrp *sgr;
    int is_shadow = 0;
#endif

    /*
     * Get my name so that I can use it to report errors.
     */
    Prog = Basename (argv[0]);

    setlocale (LC_ALL, "");
    bindtextdomain (PACKAGE, LOCALEDIR);
    textdomain (PACKAGE);

    OPENLOG ("grpck");

    /*
     * Parse the command line arguments
     */
    while ((arg = getopt (argc, argv, "qrs")) != EOF) {
        switch (arg) {
        case 'q':
            /* quiet - ignored for now */
            break;
        case 'r':
            read_only = 1;
            break;
        case 's':
            sort_mode = 1;
            break;
        default:
            usage ();
        }
    }

    if (sort_mode && read_only) {
        fprintf (stderr, _("%s: -s and -r are incompatibile\n"), Prog);
        exit (E_USAGE);
    }

    /*
     * Make certain we have the right number of arguments
     */
#ifdef	SHADOWGRP
    if (optind != argc && optind + 1 != argc && optind + 2 != argc)
#else
    if (optind != argc && optind + 1 != argc)
#endif
        usage ();

    /*
     * If there are two left over filenames, use those as the group and
     * group password filenames.
     */
    if (optind != argc) {
        grp_file = argv[optind];
        gr_name (grp_file);
    }
#ifdef	SHADOWGRP
    if (optind + 2 == argc) {
        sgr_file = argv[optind + 1];
        sgr_name (sgr_file);
        is_shadow = 1;
    } else if (optind == argc)
        is_shadow = sgr_file_present ();
#endif

    /*
     * Lock the files if we aren't in "read-only" mode
     */
    if (!read_only) {
        if (!gr_lock ()) {
            fprintf (stderr, _("%s: cannot lock file %s\n"),
                     Prog, grp_file);
            if (optind == argc)
                SYSLOG ((LOG_WARN, "cannot lock %s", grp_file));
            closelog ();
            exit (E_CANT_LOCK);
        }
#ifdef	SHADOWGRP
        if (is_shadow && !sgr_lock ()) {
            fprintf (stderr, _("%s: cannot lock file %s\n"),
                     Prog, sgr_file);
            if (optind == argc)
                SYSLOG ((LOG_WARN, "cannot lock %s", sgr_file));
            closelog ();
            exit (E_CANT_LOCK);
        }
#endif
    }

    /*
     * Open the files. Use O_RDONLY if we are in read_only mode,
     * O_RDWR otherwise.
     */
    if (!gr_open (read_only ? O_RDONLY : O_RDWR)) {
        fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
                 grp_file);
        if (optind == argc)
            SYSLOG ((LOG_WARN, "cannot open %s", grp_file));
        closelog ();
        exit (E_CANT_OPEN);
    }
#ifdef	SHADOWGRP
    if (is_shadow && !sgr_open (read_only ? O_RDONLY : O_RDWR)) {
        fprintf (stderr, _("%s: cannot open file %s\n"), Prog,
                 sgr_file);
        if (optind == argc)
            SYSLOG ((LOG_WARN, "cannot open %s", sgr_file));
        closelog ();
        exit (E_CANT_OPEN);
    }
#endif

    if (sort_mode) {
        gr_sort ();
#ifdef	SHADOWGRP
        if (is_shadow)
            sgr_sort ();
#endif
        goto write_and_bye;
    }

    /*
     * Loop through the entire group file.
     */
    for (gre = __gr_get_head (); gre; gre = gre->next) {
        /*
         * Skip all NIS entries.
         */

        if (gre->line[0] == '+' || gre->line[0] == '-')
            continue;

        /*
         * Start with the entries that are completely corrupt. They
         * have no (struct group) entry because they couldn't be
         * parsed properly.
         */
        if (!gre->eptr) {

            /*
             * Tell the user this entire line is bogus and ask
             * them to delete it.
             */
            printf (_("invalid group file entry\n"));
            printf (_("delete line `%s'? "), gre->line);
            errors++;

            /*
             * prompt the user to delete the entry or not
             */
            if (!yes_or_no ())
                continue;

            /*
             * All group file deletions wind up here. This code
             * removes the current entry from the linked list.
             * When done, it skips back to the top of the loop
             * to try out the next list element.
             */
delete_gr:
            SYSLOG ((LOG_INFO, "delete group line `%s'",
                     gre->line));
            deleted++;

            __gr_del_entry (gre);
            continue;
        }

        /*
         * Group structure is good, start using it.
         */
        grp = gre->eptr;

        /*
         * Make sure this entry has a unique name.
         */
        for (tgre = __gr_get_head (); tgre; tgre = tgre->next) {

            const struct group *ent = tgre->eptr;

            /*
             * Don't check this entry
             */
            if (tgre == gre)
                continue;

            /*
             * Don't check invalid entries.
             */
            if (!ent)
                continue;

            if (strcmp (grp->gr_name, ent->gr_name) != 0)
                continue;

            /*
             * Tell the user this entry is a duplicate of
             * another and ask them to delete it.
             */
            printf (_("duplicate group entry\n"));
            printf (_("delete line `%s'? "), gre->line);
            errors++;

            /*
             * prompt the user to delete the entry or not
             */
            if (yes_or_no ())
                goto delete_gr;
        }

        /*
         * Check for invalid group names.  --marekm
         */
        if (!check_group_name (grp->gr_name)) {
            errors++;
            printf (_("invalid group name `%s'\n"), grp->gr_name);
        }

        /*
         * Workaround for a NYS libc 5.3.12 bug on RedHat 4.2 -
         * groups with no members are returned as groups with one
         * member "", causing grpck to fail.  --marekm
         */
        if (grp->gr_mem[0] && !grp->gr_mem[1]
                && *(grp->gr_mem[0]) == '\0')
            grp->gr_mem[0] = (char *) 0;

        /*
         * Make sure each member exists
         */
        for (i = 0; grp->gr_mem[i]; i++) {
            if (getpwnam (grp->gr_mem[i]))
                continue;
            /*
             * Can't find this user. Remove them
             * from the list.
             */
            errors++;
            printf (_("group %s: no user %s\n"),
                    grp->gr_name, grp->gr_mem[i]);
            printf (_("delete member `%s'? "), grp->gr_mem[i]);

            if (!yes_or_no ())
                continue;

            SYSLOG ((LOG_INFO, "delete member `%s' group `%s'",
                     grp->gr_mem[i], grp->gr_name));
            deleted++;
            delete_member (grp->gr_mem, grp->gr_mem[i]);
            gre->changed = 1;
            __gr_set_changed ();
        }
    }

#ifdef	SHADOWGRP
    if (!is_shadow)
        goto shadow_done;

    /*
     * Loop through the entire shadow group file.
     */
    for (sge = __sgr_get_head (); sge; sge = sge->next) {

        /*
         * Start with the entries that are completely corrupt. They
         * have no (struct sgrp) entry because they couldn't be
         * parsed properly.
         */
        if (!sge->eptr) {

            /*
             * Tell the user this entire line is bogus and ask
             * them to delete it.
             */
            printf (_("invalid shadow group file entry\n"));
            printf (_("delete line `%s'? "), sge->line);
            errors++;

            /*
             * prompt the user to delete the entry or not
             */
            if (!yes_or_no ())
                continue;

            /*
             * All shadow group file deletions wind up here.
             * This code removes the current entry from the
             * linked list. When done, it skips back to the top
             * of the loop to try out the next list element.
             */
delete_sg:
            SYSLOG ((LOG_INFO, "delete shadow line `%s'",
                     sge->line));
            deleted++;

            __sgr_del_entry (sge);
            continue;
        }

        /*
         * Shadow group structure is good, start using it.
         */
        sgr = sge->eptr;

        /*
         * Make sure this entry has a unique name.
         */
        for (tsge = __sgr_get_head (); tsge; tsge = tsge->next) {

            const struct sgrp *ent = tsge->eptr;

            /*
             * Don't check this entry
             */
            if (tsge == sge)
                continue;

            /*
             * Don't check invalid entries.
             */
            if (!ent)
                continue;

            if (strcmp (sgr->sg_name, ent->sg_name) != 0)
                continue;

            /*
             * Tell the user this entry is a duplicate of
             * another and ask them to delete it.
             */
            printf (_("duplicate shadow group entry\n"));
            printf (_("delete line `%s'? "), sge->line);
            errors++;

            /*
             * prompt the user to delete the entry or not
             */
            if (yes_or_no ())
                goto delete_sg;
        }

        /*
         * Make sure this entry exists in the /etc/group file.
         */
        if (!gr_locate (sgr->sg_name)) {
            printf (_("no matching group file entry\n"));
            printf (_("delete line `%s'? "), sge->line);
            errors++;
            if (yes_or_no ())
                goto delete_sg;
        }

        /*
         * Make sure each administrator exists
         */
        for (i = 0; sgr->sg_adm[i]; i++) {
            if (getpwnam (sgr->sg_adm[i]))
                continue;
            /*
             * Can't find this user. Remove them
             * from the list.
             */
            errors++;
            printf (_
                    ("shadow group %s: no administrative user %s\n"),
                    sgr->sg_name, sgr->sg_adm[i]);
            printf (_("delete administrative member `%s'? "),
                    sgr->sg_adm[i]);

            if (!yes_or_no ())
                continue;

            SYSLOG ((LOG_INFO,
                     "delete admin `%s' from shadow group `%s'",
                     sgr->sg_adm[i], sgr->sg_name));
            deleted++;
            delete_member (sgr->sg_adm, sgr->sg_adm[i]);
            sge->changed = 1;
            __sgr_set_changed ();
        }

        /*
         * Make sure each member exists
         */
        for (i = 0; sgr->sg_mem[i]; i++) {
            if (getpwnam (sgr->sg_mem[i]))
                continue;

            /*
             * Can't find this user. Remove them from the list.
             */
            errors++;
            printf (_("shadow group %s: no user %s\n"),
                    sgr->sg_name, sgr->sg_mem[i]);
            printf (_("delete member `%s'? "), sgr->sg_mem[i]);

            if (!yes_or_no ())
                continue;

            SYSLOG ((LOG_INFO,
                     "delete member `%s' from shadow group `%s'",
                     sgr->sg_mem[i], sgr->sg_name));
            deleted++;
            delete_member (sgr->sg_mem, sgr->sg_mem[i]);
            sge->changed = 1;
            __sgr_set_changed ();
        }
    }

shadow_done:
#endif				/* SHADOWGRP */

    /*
     * All done. If there were no deletions we can just abandon any
     * changes to the files.
     */
    if (deleted) {
write_and_bye:
        if (!gr_close ()) {
            fprintf (stderr, _("%s: cannot update file %s\n"),
                     Prog, grp_file);
            exit (E_CANT_UPDATE);
        }
#ifdef	SHADOWGRP
        if (is_shadow && !sgr_close ()) {
            fprintf (stderr, _("%s: cannot update file %s\n"),
                     Prog, sgr_file);
            exit (E_CANT_UPDATE);
        }
#endif
    }

    /*
     * Don't be anti-social - unlock the files when you're done.
     */
#ifdef	SHADOWGRP
    if (is_shadow)
        sgr_unlock ();
#endif
    (void) gr_unlock ();

    nscd_flush_cache ("group");

    /*
     * Tell the user what we did and exit.
     */
    if (errors)
        printf (deleted ?
                _("%s: the files have been updated\n") :
                _("%s: no changes\n"), Prog);

    exit (errors ? E_BAD_ENTRY : E_OKAY);
}