839 lines
17 KiB
Plaintext
839 lines
17 KiB
Plaintext
/* $OpenBSD: parse.y,v 1.18 2015/01/16 06:40:22 deraadt Exp $ */
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/* $FreeBSD$ */
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/*
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* Copyright (c) 2008 Pierre-Yves Ritschard <pyr@openbsd.org>
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* Copyright (c) 2007, 2008 Reyk Floeter <reyk@openbsd.org>
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* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
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* Copyright (c) 2004 Ryan McBride <mcbride@openbsd.org>
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* Copyright (c) 2002, 2003, 2004 Henning Brauer <henning@openbsd.org>
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* Copyright (c) 2001 Markus Friedl. All rights reserved.
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* Copyright (c) 2001 Daniel Hartmeier. All rights reserved.
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* Copyright (c) 2001 Theo de Raadt. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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%{
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/queue.h>
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#include <sys/tree.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "ypldap.h"
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TAILQ_HEAD(files, file) files = TAILQ_HEAD_INITIALIZER(files);
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static struct file {
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TAILQ_ENTRY(file) entry;
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FILE *stream;
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char *name;
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int lineno;
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int errors;
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} *file, *topfile;
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struct file *pushfile(const char *, int);
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int popfile(void);
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int check_file_secrecy(int, const char *);
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int yyparse(void);
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int yylex(void);
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int yyerror(const char *, ...)
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__attribute__((__format__ (printf, 1, 2)))
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__attribute__((__nonnull__ (1)));
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int kw_cmp(const void *, const void *);
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int lookup(char *);
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int lgetc(int);
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int lungetc(int);
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int findeol(void);
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TAILQ_HEAD(symhead, sym) symhead = TAILQ_HEAD_INITIALIZER(symhead);
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struct sym {
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TAILQ_ENTRY(sym) entry;
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int used;
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int persist;
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char *nam;
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char *val;
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};
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int symset(const char *, const char *, int);
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char *symget(const char *);
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struct env *conf = NULL;
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struct idm *idm = NULL;
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static int errors = 0;
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typedef struct {
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union {
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int64_t number;
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char *string;
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} v;
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int lineno;
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} YYSTYPE;
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%}
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%token SERVER FILTER ATTRIBUTE BASEDN BINDDN GROUPDN BINDCRED MAPS CHANGE DOMAIN PROVIDE
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%token USER GROUP TO EXPIRE HOME SHELL GECOS UID GID INTERVAL
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%token PASSWD NAME FIXED LIST GROUPNAME GROUPPASSWD GROUPGID MAP
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%token INCLUDE DIRECTORY CLASS PORT ERROR GROUPMEMBERS
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%token <v.string> STRING
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%token <v.number> NUMBER
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%type <v.number> opcode attribute
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%type <v.string> port
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%%
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grammar : /* empty */
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| grammar '\n'
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| grammar include '\n'
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| grammar varset '\n'
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| grammar directory '\n'
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| grammar main '\n'
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| grammar error '\n' { file->errors++; }
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;
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nl : '\n' optnl
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;
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optnl : '\n' optnl
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| /* empty */
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;
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include : INCLUDE STRING {
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struct file *nfile;
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if ((nfile = pushfile($2, 0)) == NULL) {
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yyerror("failed to include file %s", $2);
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free($2);
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YYERROR;
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}
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free($2);
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file = nfile;
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lungetc('\n');
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}
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;
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varset : STRING '=' STRING {
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if (symset($1, $3, 0) == -1)
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fatal("cannot store variable");
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free($1);
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free($3);
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}
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;
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port : /* empty */ { $$ = NULL; }
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| PORT STRING { $$ = $2; }
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;
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opcode : GROUP { $$ = 0; }
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| PASSWD { $$ = 1; }
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;
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attribute : NAME { $$ = 0; }
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| PASSWD { $$ = 1; }
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| UID { $$ = 2; }
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| GID { $$ = 3; }
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| CLASS { $$ = 4; }
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| CHANGE { $$ = 5; }
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| EXPIRE { $$ = 6; }
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| GECOS { $$ = 7; }
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| HOME { $$ = 8; }
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| SHELL { $$ = 9; }
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| GROUPNAME { $$ = 10; }
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| GROUPPASSWD { $$ = 11; }
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| GROUPGID { $$ = 12; }
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| GROUPMEMBERS { $$ = 13; }
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;
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diropt : BINDDN STRING {
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idm->idm_flags |= F_NEEDAUTH;
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if (strlcpy(idm->idm_binddn, $2,
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sizeof(idm->idm_binddn)) >=
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sizeof(idm->idm_binddn)) {
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yyerror("directory binddn truncated");
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free($2);
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YYERROR;
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}
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free($2);
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}
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| BINDCRED STRING {
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idm->idm_flags |= F_NEEDAUTH;
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if (strlcpy(idm->idm_bindcred, $2,
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sizeof(idm->idm_bindcred)) >=
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sizeof(idm->idm_bindcred)) {
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yyerror("directory bindcred truncated");
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free($2);
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YYERROR;
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}
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free($2);
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}
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| BASEDN STRING {
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if (strlcpy(idm->idm_basedn, $2,
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sizeof(idm->idm_basedn)) >=
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sizeof(idm->idm_basedn)) {
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yyerror("directory basedn truncated");
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free($2);
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YYERROR;
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}
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free($2);
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}
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| GROUPDN STRING {
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if(strlcpy(idm->idm_groupdn, $2,
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sizeof(idm->idm_groupdn)) >=
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sizeof(idm->idm_groupdn)) {
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yyerror("directory groupdn truncated");
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free($2);
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YYERROR;
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}
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free($2);
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}
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| opcode FILTER STRING {
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if (strlcpy(idm->idm_filters[$1], $3,
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sizeof(idm->idm_filters[$1])) >=
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sizeof(idm->idm_filters[$1])) {
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yyerror("filter truncated");
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free($3);
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YYERROR;
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}
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free($3);
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}
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| ATTRIBUTE attribute MAPS TO STRING {
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if (strlcpy(idm->idm_attrs[$2], $5,
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sizeof(idm->idm_attrs[$2])) >=
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sizeof(idm->idm_attrs[$2])) {
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yyerror("attribute truncated");
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free($5);
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YYERROR;
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}
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free($5);
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}
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| FIXED ATTRIBUTE attribute STRING {
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if (strlcpy(idm->idm_attrs[$3], $4,
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sizeof(idm->idm_attrs[$3])) >=
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sizeof(idm->idm_attrs[$3])) {
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yyerror("attribute truncated");
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free($4);
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YYERROR;
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}
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idm->idm_flags |= F_FIXED_ATTR($3);
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free($4);
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}
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| LIST attribute MAPS TO STRING {
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if (strlcpy(idm->idm_attrs[$2], $5,
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sizeof(idm->idm_attrs[$2])) >=
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sizeof(idm->idm_attrs[$2])) {
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yyerror("attribute truncated");
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free($5);
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YYERROR;
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}
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idm->idm_list |= F_LIST($2);
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free($5);
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}
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;
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directory : DIRECTORY STRING port {
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if ((idm = calloc(1, sizeof(*idm))) == NULL)
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fatal(NULL);
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idm->idm_id = conf->sc_maxid++;
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if (strlcpy(idm->idm_name, $2,
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sizeof(idm->idm_name)) >=
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sizeof(idm->idm_name)) {
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yyerror("attribute truncated");
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free($2);
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YYERROR;
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}
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free($2);
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} '{' optnl diropts '}' {
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TAILQ_INSERT_TAIL(&conf->sc_idms, idm, idm_entry);
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idm = NULL;
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}
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;
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main : INTERVAL NUMBER {
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conf->sc_conf_tv.tv_sec = $2;
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conf->sc_conf_tv.tv_usec = 0;
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}
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| DOMAIN STRING {
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if (strlcpy(conf->sc_domainname, $2,
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sizeof(conf->sc_domainname)) >=
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sizeof(conf->sc_domainname)) {
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yyerror("domainname truncated");
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free($2);
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YYERROR;
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}
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free($2);
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}
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| PROVIDE MAP STRING {
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if (strcmp($3, "passwd.byname") == 0)
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conf->sc_flags |= YPMAP_PASSWD_BYNAME;
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else if (strcmp($3, "passwd.byuid") == 0)
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conf->sc_flags |= YPMAP_PASSWD_BYUID;
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else if (strcmp($3, "master.passwd.byname") == 0)
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conf->sc_flags |= YPMAP_MASTER_PASSWD_BYNAME;
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else if (strcmp($3, "master.passwd.byuid") == 0)
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conf->sc_flags |= YPMAP_MASTER_PASSWD_BYUID;
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else if (strcmp($3, "group.byname") == 0)
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conf->sc_flags |= YPMAP_GROUP_BYNAME;
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else if (strcmp($3, "group.bygid") == 0)
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conf->sc_flags |= YPMAP_GROUP_BYGID;
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else if (strcmp($3, "netid.byname") == 0)
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conf->sc_flags |= YPMAP_NETID_BYNAME;
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else {
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yyerror("unsupported map type: %s", $3);
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free($3);
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YYERROR;
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}
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free($3);
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}
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;
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diropts : diropts diropt nl
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| diropt optnl
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;
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%%
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struct keywords {
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const char *k_name;
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int k_val;
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};
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int
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yyerror(const char *fmt, ...)
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{
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va_list ap;
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char *msg;
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file->errors++;
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va_start(ap, fmt);
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if (vasprintf(&msg, fmt, ap) == -1)
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fatalx("yyerror vasprintf");
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va_end(ap);
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logit(LOG_CRIT, "%s:%d: %s", file->name, yylval.lineno, msg);
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free(msg);
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return (0);
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}
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int
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kw_cmp(const void *k, const void *e)
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{
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return (strcmp(k, ((const struct keywords *)e)->k_name));
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}
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int
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lookup(char *s)
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{
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/* this has to be sorted always */
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static const struct keywords keywords[] = {
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{ "attribute", ATTRIBUTE },
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{ "basedn", BASEDN },
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{ "bindcred", BINDCRED },
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{ "binddn", BINDDN },
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{ "change", CHANGE },
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{ "class", CLASS },
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{ "directory", DIRECTORY },
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{ "domain", DOMAIN },
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{ "expire", EXPIRE },
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{ "filter", FILTER },
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{ "fixed", FIXED },
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{ "gecos", GECOS },
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{ "gid", GID },
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{ "group", GROUP },
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{ "groupdn", GROUPDN },
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{ "groupgid", GROUPGID },
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{ "groupmembers", GROUPMEMBERS },
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{ "groupname", GROUPNAME },
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{ "grouppasswd", GROUPPASSWD },
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{ "home", HOME },
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{ "include", INCLUDE },
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{ "interval", INTERVAL },
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{ "list", LIST },
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{ "map", MAP },
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{ "maps", MAPS },
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{ "name", NAME },
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{ "passwd", PASSWD },
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{ "port", PORT },
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{ "provide", PROVIDE },
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{ "server", SERVER },
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{ "shell", SHELL },
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{ "to", TO },
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{ "uid", UID },
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{ "user", USER },
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};
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const struct keywords *p;
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p = bsearch(s, keywords, sizeof(keywords)/sizeof(keywords[0]),
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sizeof(keywords[0]), kw_cmp);
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if (p)
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return (p->k_val);
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else
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return (STRING);
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}
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#define MAXPUSHBACK 128
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u_char *parsebuf;
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int parseindex;
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u_char pushback_buffer[MAXPUSHBACK];
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int pushback_index = 0;
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int
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lgetc(int quotec)
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{
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int c, next;
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if (parsebuf) {
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/* Read character from the parsebuffer instead of input. */
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if (parseindex >= 0) {
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c = parsebuf[parseindex++];
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if (c != '\0')
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return (c);
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parsebuf = NULL;
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} else
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parseindex++;
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}
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|
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if (pushback_index)
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return (pushback_buffer[--pushback_index]);
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|
|
if (quotec) {
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if ((c = getc(file->stream)) == EOF) {
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yyerror("reached end of file while parsing "
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"quoted string");
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if (file == topfile || popfile() == EOF)
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return (EOF);
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return (quotec);
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}
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return (c);
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}
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while ((c = getc(file->stream)) == '\\') {
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next = getc(file->stream);
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|
if (next != '\n') {
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c = next;
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break;
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}
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yylval.lineno = file->lineno;
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file->lineno++;
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}
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|
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while (c == EOF) {
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if (file == topfile || popfile() == EOF)
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return (EOF);
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c = getc(file->stream);
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}
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return (c);
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}
|
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|
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int
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lungetc(int c)
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{
|
|
if (c == EOF)
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return (EOF);
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|
if (parsebuf) {
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parseindex--;
|
|
if (parseindex >= 0)
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return (c);
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}
|
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if (pushback_index < MAXPUSHBACK-1)
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return (pushback_buffer[pushback_index++] = c);
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else
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return (EOF);
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}
|
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|
|
int
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findeol(void)
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{
|
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int c;
|
|
|
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parsebuf = NULL;
|
|
|
|
/* skip to either EOF or the first real EOL */
|
|
while (1) {
|
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if (pushback_index)
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c = pushback_buffer[--pushback_index];
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else
|
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c = lgetc(0);
|
|
if (c == '\n') {
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file->lineno++;
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break;
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}
|
|
if (c == EOF)
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break;
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}
|
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return (ERROR);
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}
|
|
|
|
int
|
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yylex(void)
|
|
{
|
|
u_char buf[8096];
|
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u_char *p, *val;
|
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int quotec, next, c;
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int token;
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top:
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p = buf;
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while ((c = lgetc(0)) == ' ' || c == '\t')
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; /* nothing */
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|
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yylval.lineno = file->lineno;
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if (c == '#')
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while ((c = lgetc(0)) != '\n' && c != EOF)
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; /* nothing */
|
|
if (c == '$' && parsebuf == NULL) {
|
|
while (1) {
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|
if ((c = lgetc(0)) == EOF)
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return (0);
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|
|
if (p + 1 >= buf + sizeof(buf) - 1) {
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yyerror("string too long");
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return (findeol());
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}
|
|
if (isalnum(c) || c == '_') {
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*p++ = c;
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continue;
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}
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*p = '\0';
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lungetc(c);
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break;
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}
|
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val = symget(buf);
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if (val == NULL) {
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yyerror("macro '%s' not defined", buf);
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return (findeol());
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}
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parsebuf = val;
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parseindex = 0;
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goto top;
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}
|
|
|
|
switch (c) {
|
|
case '\'':
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|
case '"':
|
|
quotec = c;
|
|
while (1) {
|
|
if ((c = lgetc(quotec)) == EOF)
|
|
return (0);
|
|
if (c == '\n') {
|
|
file->lineno++;
|
|
continue;
|
|
} else if (c == '\\') {
|
|
if ((next = lgetc(quotec)) == EOF)
|
|
return (0);
|
|
if (next == quotec || c == ' ' || c == '\t')
|
|
c = next;
|
|
else if (next == '\n') {
|
|
file->lineno++;
|
|
continue;
|
|
} else
|
|
lungetc(next);
|
|
} else if (c == quotec) {
|
|
*p = '\0';
|
|
break;
|
|
} else if (c == '\0') {
|
|
yyerror("syntax error");
|
|
return (findeol());
|
|
}
|
|
if (p + 1 >= buf + sizeof(buf) - 1) {
|
|
yyerror("string too long");
|
|
return (findeol());
|
|
}
|
|
*p++ = c;
|
|
}
|
|
yylval.v.string = strdup(buf);
|
|
if (yylval.v.string == NULL)
|
|
err(1, "yylex: strdup");
|
|
return (STRING);
|
|
}
|
|
|
|
#define allowed_to_end_number(x) \
|
|
(isspace(x) || x == ')' || x ==',' || x == '/' || x == '}' || x == '=')
|
|
|
|
if (c == '-' || isdigit(c)) {
|
|
do {
|
|
*p++ = c;
|
|
if ((unsigned)(p-buf) >= sizeof(buf)) {
|
|
yyerror("string too long");
|
|
return (findeol());
|
|
}
|
|
} while ((c = lgetc(0)) != EOF && isdigit(c));
|
|
lungetc(c);
|
|
if (p == buf + 1 && buf[0] == '-')
|
|
goto nodigits;
|
|
if (c == EOF || allowed_to_end_number(c)) {
|
|
const char *errstr = NULL;
|
|
|
|
*p = '\0';
|
|
yylval.v.number = strtonum(buf, LLONG_MIN,
|
|
LLONG_MAX, &errstr);
|
|
if (errstr) {
|
|
yyerror("\"%s\" invalid number: %s",
|
|
buf, errstr);
|
|
return (findeol());
|
|
}
|
|
return (NUMBER);
|
|
} else {
|
|
nodigits:
|
|
while (p > buf + 1)
|
|
lungetc(*--p);
|
|
c = *--p;
|
|
if (c == '-')
|
|
return (c);
|
|
}
|
|
}
|
|
|
|
#define allowed_in_string(x) \
|
|
(isalnum(x) || (ispunct(x) && x != '(' && x != ')' && \
|
|
x != '{' && x != '}' && x != '<' && x != '>' && \
|
|
x != '!' && x != '=' && x != '#' && \
|
|
x != ','))
|
|
|
|
if (isalnum(c) || c == ':' || c == '_') {
|
|
do {
|
|
*p++ = c;
|
|
if ((unsigned)(p-buf) >= sizeof(buf)) {
|
|
yyerror("string too long");
|
|
return (findeol());
|
|
}
|
|
} while ((c = lgetc(0)) != EOF && (allowed_in_string(c)));
|
|
lungetc(c);
|
|
*p = '\0';
|
|
if ((token = lookup(buf)) == STRING)
|
|
if ((yylval.v.string = strdup(buf)) == NULL)
|
|
err(1, "yylex: strdup");
|
|
return (token);
|
|
}
|
|
if (c == '\n') {
|
|
yylval.lineno = file->lineno;
|
|
file->lineno++;
|
|
}
|
|
if (c == EOF)
|
|
return (0);
|
|
return (c);
|
|
}
|
|
|
|
int
|
|
check_file_secrecy(int fd, const char *fname)
|
|
{
|
|
struct stat st;
|
|
|
|
if (fstat(fd, &st)) {
|
|
log_warn("cannot stat %s", fname);
|
|
return (-1);
|
|
}
|
|
if (st.st_uid != 0 && st.st_uid != getuid()) {
|
|
log_warnx("%s: owner not root or current user", fname);
|
|
return (-1);
|
|
}
|
|
if (st.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)) {
|
|
log_warnx("%s: group writable or world read/writable", fname);
|
|
return (-1);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
struct file *
|
|
pushfile(const char *name, int secret)
|
|
{
|
|
struct file *nfile;
|
|
|
|
if ((nfile = calloc(1, sizeof(struct file))) == NULL) {
|
|
log_warn("malloc");
|
|
return (NULL);
|
|
}
|
|
if ((nfile->name = strdup(name)) == NULL) {
|
|
log_warn("malloc");
|
|
free(nfile);
|
|
return (NULL);
|
|
}
|
|
if ((nfile->stream = fopen(nfile->name, "r")) == NULL) {
|
|
log_warn("%s", nfile->name);
|
|
free(nfile->name);
|
|
free(nfile);
|
|
return (NULL);
|
|
} else if (secret &&
|
|
check_file_secrecy(fileno(nfile->stream), nfile->name)) {
|
|
fclose(nfile->stream);
|
|
free(nfile->name);
|
|
free(nfile);
|
|
return (NULL);
|
|
}
|
|
nfile->lineno = 1;
|
|
TAILQ_INSERT_TAIL(&files, nfile, entry);
|
|
return (nfile);
|
|
}
|
|
|
|
int
|
|
popfile(void)
|
|
{
|
|
struct file *prev;
|
|
|
|
if ((prev = TAILQ_PREV(file, files, entry)) != NULL)
|
|
prev->errors += file->errors;
|
|
|
|
TAILQ_REMOVE(&files, file, entry);
|
|
fclose(file->stream);
|
|
free(file->name);
|
|
free(file);
|
|
file = prev;
|
|
return (file ? 0 : EOF);
|
|
}
|
|
|
|
int
|
|
parse_config(struct env *x_conf, const char *filename, int opts)
|
|
{
|
|
struct sym *sym, *next;
|
|
|
|
conf = x_conf;
|
|
bzero(conf, sizeof(*conf));
|
|
|
|
TAILQ_INIT(&conf->sc_idms);
|
|
conf->sc_conf_tv.tv_sec = DEFAULT_INTERVAL;
|
|
conf->sc_conf_tv.tv_usec = 0;
|
|
|
|
errors = 0;
|
|
|
|
if ((file = pushfile(filename, 1)) == NULL) {
|
|
return (-1);
|
|
}
|
|
topfile = file;
|
|
|
|
/*
|
|
* parse configuration
|
|
*/
|
|
setservent(1);
|
|
yyparse();
|
|
endservent();
|
|
errors = file->errors;
|
|
popfile();
|
|
|
|
/* Free macros and check which have not been used. */
|
|
for (sym = TAILQ_FIRST(&symhead); sym != NULL; sym = next) {
|
|
next = TAILQ_NEXT(sym, entry);
|
|
if ((opts & YPLDAP_OPT_VERBOSE) && !sym->used)
|
|
fprintf(stderr, "warning: macro '%s' not "
|
|
"used\n", sym->nam);
|
|
if (!sym->persist) {
|
|
free(sym->nam);
|
|
free(sym->val);
|
|
TAILQ_REMOVE(&symhead, sym, entry);
|
|
free(sym);
|
|
}
|
|
}
|
|
|
|
if (errors) {
|
|
return (-1);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
symset(const char *nam, const char *val, int persist)
|
|
{
|
|
struct sym *sym;
|
|
|
|
for (sym = TAILQ_FIRST(&symhead); sym && strcmp(nam, sym->nam);
|
|
sym = TAILQ_NEXT(sym, entry))
|
|
; /* nothing */
|
|
|
|
if (sym != NULL) {
|
|
if (sym->persist == 1)
|
|
return (0);
|
|
else {
|
|
free(sym->nam);
|
|
free(sym->val);
|
|
TAILQ_REMOVE(&symhead, sym, entry);
|
|
free(sym);
|
|
}
|
|
}
|
|
if ((sym = calloc(1, sizeof(*sym))) == NULL)
|
|
return (-1);
|
|
|
|
sym->nam = strdup(nam);
|
|
if (sym->nam == NULL) {
|
|
free(sym);
|
|
return (-1);
|
|
}
|
|
sym->val = strdup(val);
|
|
if (sym->val == NULL) {
|
|
free(sym->nam);
|
|
free(sym);
|
|
return (-1);
|
|
}
|
|
sym->used = 0;
|
|
sym->persist = persist;
|
|
TAILQ_INSERT_TAIL(&symhead, sym, entry);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
cmdline_symset(char *s)
|
|
{
|
|
char *sym, *val;
|
|
int ret;
|
|
size_t len;
|
|
|
|
if ((val = strrchr(s, '=')) == NULL)
|
|
return (-1);
|
|
|
|
len = strlen(s) - strlen(val) + 1;
|
|
if ((sym = malloc(len)) == NULL)
|
|
errx(1, "cmdline_symset: malloc");
|
|
|
|
(void)strlcpy(sym, s, len);
|
|
|
|
ret = symset(sym, val + 1, 1);
|
|
free(sym);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
char *
|
|
symget(const char *nam)
|
|
{
|
|
struct sym *sym;
|
|
|
|
TAILQ_FOREACH(sym, &symhead, entry)
|
|
if (strcmp(nam, sym->nam) == 0) {
|
|
sym->used = 1;
|
|
return (sym->val);
|
|
}
|
|
return (NULL);
|
|
}
|