mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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d05c99c547
Replace with arc4random. TACAS+ is a 1993 Cisco extension to the 1984 TACAS. Is this something we want in base still? The directory has been substantively unmaintained since 2002, at least.
1387 lines
32 KiB
C
1387 lines
32 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998, 2001, 2002, Juniper Networks, Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <md5.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stddef.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 <unistd.h>
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#include "taclib_private.h"
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static int add_str_8(struct tac_handle *, u_int8_t *,
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struct clnt_str *);
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static int add_str_16(struct tac_handle *, u_int16_t *,
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struct clnt_str *);
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static int protocol_version(int, int, int);
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static void close_connection(struct tac_handle *);
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static int conn_server(struct tac_handle *);
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static void crypt_msg(struct tac_handle *, struct tac_msg *);
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static void *dup_str(struct tac_handle *, const struct srvr_str *,
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size_t *);
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static int establish_connection(struct tac_handle *);
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static void free_str(struct clnt_str *);
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static void generr(struct tac_handle *, const char *, ...)
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__printflike(2, 3);
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static void gen_session_id(struct tac_msg *);
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static int get_srvr_end(struct tac_handle *);
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static int get_srvr_str(struct tac_handle *, const char *,
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struct srvr_str *, size_t);
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static void init_clnt_str(struct clnt_str *);
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static void init_srvr_str(struct srvr_str *);
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static int read_timed(struct tac_handle *, void *, size_t,
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const struct timeval *);
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static int recv_msg(struct tac_handle *);
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static int save_str(struct tac_handle *, struct clnt_str *,
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const void *, size_t);
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static int send_msg(struct tac_handle *);
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static int split(char *, char *[], int, char *, size_t);
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static void *xmalloc(struct tac_handle *, size_t);
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static char *xstrdup(struct tac_handle *, const char *);
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static void clear_srvr_avs(struct tac_handle *);
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static void create_msg(struct tac_handle *, int, int, int);
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/*
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* Append some optional data to the current request, and store its
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* length into the 8-bit field referenced by "fld". Returns 0 on
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* success, or -1 on failure.
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*
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* This function also frees the "cs" string data and initializes it
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* for the next time.
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*/
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static int
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add_str_8(struct tac_handle *h, u_int8_t *fld, struct clnt_str *cs)
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{
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u_int16_t len;
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if (add_str_16(h, &len, cs) == -1)
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return -1;
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len = ntohs(len);
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if (len > 0xff) {
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generr(h, "Field too long");
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return -1;
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}
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*fld = len;
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return 0;
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}
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/*
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* Append some optional data to the current request, and store its
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* length into the 16-bit field (network byte order) referenced by
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* "fld". Returns 0 on success, or -1 on failure.
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*
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* This function also frees the "cs" string data and initializes it
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* for the next time.
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*/
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static int
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add_str_16(struct tac_handle *h, u_int16_t *fld, struct clnt_str *cs)
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{
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size_t len;
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len = cs->len;
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if (cs->data == NULL)
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len = 0;
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if (len != 0) {
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int offset;
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if (len > 0xffff) {
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generr(h, "Field too long");
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return -1;
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}
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offset = ntohl(h->request.length);
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if (offset + len > BODYSIZE) {
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generr(h, "Message too long");
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return -1;
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}
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memcpy(h->request.u.body + offset, cs->data, len);
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h->request.length = htonl(offset + len);
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}
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*fld = htons(len);
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free_str(cs);
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return 0;
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}
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static int
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protocol_version(int msg_type, int var, int type)
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{
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int minor;
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switch (msg_type) {
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case TAC_AUTHEN:
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/* 'var' represents the 'action' */
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switch (var) {
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case TAC_AUTHEN_LOGIN:
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switch (type) {
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case TAC_AUTHEN_TYPE_PAP:
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case TAC_AUTHEN_TYPE_CHAP:
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case TAC_AUTHEN_TYPE_MSCHAP:
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case TAC_AUTHEN_TYPE_ARAP:
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minor = 1;
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break;
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default:
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minor = 0;
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break;
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}
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break;
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case TAC_AUTHEN_SENDAUTH:
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minor = 1;
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break;
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default:
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minor = 0;
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break;
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};
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break;
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case TAC_AUTHOR:
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/* 'var' represents the 'method' */
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switch (var) {
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/*
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* When new authentication methods are added, include 'method'
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* in determining the value of 'minor'. At this point, all
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* methods defined in this implementation (see "Authorization
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* authentication methods" in taclib.h) are minor version 0
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* Not all types, however, indicate minor version 0.
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*/
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case TAC_AUTHEN_METH_NOT_SET:
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case TAC_AUTHEN_METH_NONE:
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case TAC_AUTHEN_METH_KRB5:
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case TAC_AUTHEN_METH_LINE:
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case TAC_AUTHEN_METH_ENABLE:
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case TAC_AUTHEN_METH_LOCAL:
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case TAC_AUTHEN_METH_TACACSPLUS:
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case TAC_AUTHEN_METH_RCMD:
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switch (type) {
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case TAC_AUTHEN_TYPE_PAP:
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case TAC_AUTHEN_TYPE_CHAP:
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case TAC_AUTHEN_TYPE_MSCHAP:
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case TAC_AUTHEN_TYPE_ARAP:
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minor = 1;
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break;
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default:
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minor = 0;
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break;
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}
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break;
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default:
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minor = 0;
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break;
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}
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break;
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case TAC_ACCT:
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default:
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minor = 0;
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break;
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}
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return TAC_VER_MAJOR << 4 | minor;
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}
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static void
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close_connection(struct tac_handle *h)
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{
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if (h->fd != -1) {
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close(h->fd);
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h->fd = -1;
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}
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}
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static int
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conn_server(struct tac_handle *h)
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{
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const struct tac_server *srvp = &h->servers[h->cur_server];
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int flags;
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if ((h->fd = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) == -1) {
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generr(h, "Cannot create socket: %s", strerror(errno));
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return -1;
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}
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if ((flags = fcntl(h->fd, F_GETFL, 0)) == -1 ||
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fcntl(h->fd, F_SETFL, flags | O_NONBLOCK) == -1) {
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generr(h, "Cannot set non-blocking mode on socket: %s",
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strerror(errno));
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close(h->fd);
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h->fd = -1;
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return -1;
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}
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if (connect(h->fd, (struct sockaddr *)&srvp->addr,
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sizeof srvp->addr) == 0)
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return 0;
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if (errno == EINPROGRESS) {
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fd_set wfds;
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struct timeval tv;
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int nfds;
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struct sockaddr peer;
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socklen_t errlen, peerlen;
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int err;
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/* Wait for the connection to complete. */
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FD_ZERO(&wfds);
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FD_SET(h->fd, &wfds);
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tv.tv_sec = srvp->timeout;
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tv.tv_usec = 0;
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nfds = select(h->fd + 1, NULL, &wfds, NULL, &tv);
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if (nfds == -1) {
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generr(h, "select: %s", strerror(errno));
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close(h->fd);
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h->fd = -1;
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return -1;
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}
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if (nfds == 0) {
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generr(h, "connect: timed out");
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close(h->fd);
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h->fd = -1;
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return -1;
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}
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/* See whether we are connected now. */
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peerlen = sizeof peer;
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if (getpeername(h->fd, &peer, &peerlen) == 0)
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return 0;
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if (errno != ENOTCONN) {
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generr(h, "getpeername: %s", strerror(errno));
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close(h->fd);
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h->fd = -1;
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return -1;
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}
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/* Find out why the connect failed. */
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errlen = sizeof err;
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getsockopt(h->fd, SOL_SOCKET, SO_ERROR, &err, &errlen);
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errno = err;
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}
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generr(h, "connect: %s", strerror(errno));
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close(h->fd);
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h->fd = -1;
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return -1;
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}
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/*
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* Encrypt or decrypt a message. The operations are symmetrical.
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*/
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static void
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crypt_msg(struct tac_handle *h, struct tac_msg *msg)
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{
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const char *secret;
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MD5_CTX base_ctx;
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MD5_CTX ctx;
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unsigned char md5[16];
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int chunk;
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int msg_len;
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secret = h->servers[h->cur_server].secret;
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if (secret[0] == '\0')
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msg->flags |= TAC_UNENCRYPTED;
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if (msg->flags & TAC_UNENCRYPTED)
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return;
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msg_len = ntohl(msg->length);
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MD5Init(&base_ctx);
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MD5Update(&base_ctx, msg->session_id, sizeof msg->session_id);
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MD5Update(&base_ctx, secret, strlen(secret));
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MD5Update(&base_ctx, &msg->version, sizeof msg->version);
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MD5Update(&base_ctx, &msg->seq_no, sizeof msg->seq_no);
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ctx = base_ctx;
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for (chunk = 0; chunk < msg_len; chunk += sizeof md5) {
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int chunk_len;
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int i;
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MD5Final(md5, &ctx);
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if ((chunk_len = msg_len - chunk) > sizeof md5)
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chunk_len = sizeof md5;
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for (i = 0; i < chunk_len; i++)
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msg->u.body[chunk + i] ^= md5[i];
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ctx = base_ctx;
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MD5Update(&ctx, md5, sizeof md5);
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}
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}
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/*
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* Return a dynamically allocated copy of the given server string.
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* The copy is null-terminated. If "len" is non-NULL, the length of
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* the string (excluding the terminating null byte) is stored via it.
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* Returns NULL on failure. Empty strings are still allocated even
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* though they have no content.
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*/
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static void *
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dup_str(struct tac_handle *h, const struct srvr_str *ss, size_t *len)
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{
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unsigned char *p;
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if ((p = (unsigned char *)xmalloc(h, ss->len + 1)) == NULL)
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return NULL;
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if (ss->data != NULL && ss->len != 0)
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memcpy(p, ss->data, ss->len);
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p[ss->len] = '\0';
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if (len != NULL)
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*len = ss->len;
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return p;
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}
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static int
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establish_connection(struct tac_handle *h)
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{
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int i;
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if (h->fd >= 0) /* Already connected. */
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return 0;
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if (h->num_servers == 0) {
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generr(h, "No TACACS+ servers specified");
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return -1;
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}
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/*
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* Try the servers round-robin. We begin with the one that
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* worked for us the last time. That way, once we find a good
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* server, we won't waste any more time trying the bad ones.
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*/
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for (i = 0; i < h->num_servers; i++) {
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if (conn_server(h) == 0) {
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h->single_connect = (h->servers[h->cur_server].flags &
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TAC_SRVR_SINGLE_CONNECT) != 0;
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return 0;
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}
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if (++h->cur_server >= h->num_servers) /* Wrap around */
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h->cur_server = 0;
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}
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/* Just return whatever error was last reported by conn_server(). */
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return -1;
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}
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/*
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* Free a client string, obliterating its contents first for security.
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*/
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static void
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free_str(struct clnt_str *cs)
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{
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if (cs->data != NULL) {
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memset(cs->data, 0, cs->len);
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free(cs->data);
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cs->data = NULL;
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cs->len = 0;
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}
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}
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static void
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generr(struct tac_handle *h, const char *format, ...)
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{
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va_list ap;
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va_start(ap, format);
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vsnprintf(h->errmsg, ERRSIZE, format, ap);
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va_end(ap);
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}
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static void
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gen_session_id(struct tac_msg *msg)
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{
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int r;
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r = arc4random();
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msg->session_id[0] = r >> 8;
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msg->session_id[1] = r;
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r = arc4random();
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msg->session_id[2] = r >> 8;
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msg->session_id[3] = r;
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}
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/*
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* Verify that we are exactly at the end of the response message.
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* Returns 0 on success, -1 on failure.
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*/
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static int
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get_srvr_end(struct tac_handle *h)
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{
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int len;
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len = ntohl(h->response.length);
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if (h->srvr_pos != len) {
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generr(h, "Invalid length field in response "
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"from server: end expected at %u, response length %u",
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h->srvr_pos, len);
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return -1;
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}
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return 0;
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}
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static int
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get_srvr_str(struct tac_handle *h, const char *field,
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struct srvr_str *ss, size_t len)
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{
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if (h->srvr_pos + len > ntohl(h->response.length)) {
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generr(h, "Invalid length field in %s response from server "
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"(%lu > %lu)", field, (u_long)(h->srvr_pos + len),
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(u_long)ntohl(h->response.length));
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return -1;
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}
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ss->data = len != 0 ? h->response.u.body + h->srvr_pos : NULL;
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ss->len = len;
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h->srvr_pos += len;
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return 0;
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}
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static void
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init_clnt_str(struct clnt_str *cs)
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{
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cs->data = NULL;
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cs->len = 0;
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}
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|
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static void
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init_srvr_str(struct srvr_str *ss)
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{
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ss->data = NULL;
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ss->len = 0;
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}
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|
|
static int
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read_timed(struct tac_handle *h, void *buf, size_t len,
|
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const struct timeval *deadline)
|
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{
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char *ptr;
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ptr = (char *)buf;
|
|
while (len > 0) {
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int n;
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n = read(h->fd, ptr, len);
|
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if (n == -1) {
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struct timeval tv;
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int nfds;
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|
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if (errno != EAGAIN) {
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generr(h, "Network read error: %s",
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strerror(errno));
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return -1;
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}
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|
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/* Wait until we can read more data. */
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gettimeofday(&tv, NULL);
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timersub(deadline, &tv, &tv);
|
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if (tv.tv_sec >= 0) {
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fd_set rfds;
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|
|
FD_ZERO(&rfds);
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FD_SET(h->fd, &rfds);
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nfds =
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select(h->fd + 1, &rfds, NULL, NULL, &tv);
|
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if (nfds == -1) {
|
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generr(h, "select: %s",
|
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strerror(errno));
|
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return -1;
|
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}
|
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} else
|
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nfds = 0;
|
|
if (nfds == 0) {
|
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generr(h, "Network read timed out");
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return -1;
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}
|
|
} else if (n == 0) {
|
|
generr(h, "unexpected EOF from server");
|
|
return -1;
|
|
} else {
|
|
ptr += n;
|
|
len -= n;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Receive a response from the server and decrypt it. Returns 0 on
|
|
* success, or -1 on failure.
|
|
*/
|
|
static int
|
|
recv_msg(struct tac_handle *h)
|
|
{
|
|
struct timeval deadline;
|
|
struct tac_msg *msg;
|
|
u_int32_t len;
|
|
|
|
msg = &h->response;
|
|
gettimeofday(&deadline, NULL);
|
|
deadline.tv_sec += h->servers[h->cur_server].timeout;
|
|
|
|
/* Read the message header and make sure it is reasonable. */
|
|
if (read_timed(h, msg, HDRSIZE, &deadline) == -1)
|
|
return -1;
|
|
if (memcmp(msg->session_id, h->request.session_id,
|
|
sizeof msg->session_id) != 0) {
|
|
generr(h, "Invalid session ID in received message");
|
|
return -1;
|
|
}
|
|
if (msg->type != h->request.type) {
|
|
generr(h, "Invalid type in received message"
|
|
" (got %u, expected %u)",
|
|
msg->type, h->request.type);
|
|
return -1;
|
|
}
|
|
len = ntohl(msg->length);
|
|
if (len > BODYSIZE) {
|
|
generr(h, "Received message too large (%u > %u)",
|
|
len, BODYSIZE);
|
|
return -1;
|
|
}
|
|
if (msg->seq_no != ++h->last_seq_no) {
|
|
generr(h, "Invalid sequence number in received message"
|
|
" (got %u, expected %u)",
|
|
msg->seq_no, h->last_seq_no);
|
|
return -1;
|
|
}
|
|
|
|
/* Read the message body. */
|
|
if (read_timed(h, msg->u.body, len, &deadline) == -1)
|
|
return -1;
|
|
|
|
/* Decrypt it. */
|
|
crypt_msg(h, msg);
|
|
|
|
/*
|
|
* Turn off single-connection mode if the server isn't amenable
|
|
* to it.
|
|
*/
|
|
if (!(msg->flags & TAC_SINGLE_CONNECT))
|
|
h->single_connect = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
save_str(struct tac_handle *h, struct clnt_str *cs, const void *data,
|
|
size_t len)
|
|
{
|
|
free_str(cs);
|
|
if (data != NULL && len != 0) {
|
|
if ((cs->data = xmalloc(h, len)) == NULL)
|
|
return -1;
|
|
cs->len = len;
|
|
memcpy(cs->data, data, len);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Send the current request, after encrypting it. Returns 0 on success,
|
|
* or -1 on failure.
|
|
*/
|
|
static int
|
|
send_msg(struct tac_handle *h)
|
|
{
|
|
struct timeval deadline;
|
|
struct tac_msg *msg;
|
|
char *ptr;
|
|
int len;
|
|
|
|
if (h->last_seq_no & 1) {
|
|
generr(h, "Attempt to send message out of sequence");
|
|
return -1;
|
|
}
|
|
|
|
if (establish_connection(h) == -1)
|
|
return -1;
|
|
|
|
msg = &h->request;
|
|
msg->seq_no = ++h->last_seq_no;
|
|
if (msg->seq_no == 1)
|
|
gen_session_id(msg);
|
|
crypt_msg(h, msg);
|
|
|
|
if (h->single_connect)
|
|
msg->flags |= TAC_SINGLE_CONNECT;
|
|
else
|
|
msg->flags &= ~TAC_SINGLE_CONNECT;
|
|
gettimeofday(&deadline, NULL);
|
|
deadline.tv_sec += h->servers[h->cur_server].timeout;
|
|
len = HDRSIZE + ntohl(msg->length);
|
|
ptr = (char *)msg;
|
|
while (len > 0) {
|
|
int n;
|
|
|
|
n = write(h->fd, ptr, len);
|
|
if (n == -1) {
|
|
struct timeval tv;
|
|
int nfds;
|
|
|
|
if (errno != EAGAIN) {
|
|
generr(h, "Network write error: %s",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
/* Wait until we can write more data. */
|
|
gettimeofday(&tv, NULL);
|
|
timersub(&deadline, &tv, &tv);
|
|
if (tv.tv_sec >= 0) {
|
|
fd_set wfds;
|
|
|
|
FD_ZERO(&wfds);
|
|
FD_SET(h->fd, &wfds);
|
|
nfds =
|
|
select(h->fd + 1, NULL, &wfds, NULL, &tv);
|
|
if (nfds == -1) {
|
|
generr(h, "select: %s",
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
} else
|
|
nfds = 0;
|
|
if (nfds == 0) {
|
|
generr(h, "Network write timed out");
|
|
return -1;
|
|
}
|
|
} else {
|
|
ptr += n;
|
|
len -= n;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Destructively split a string into fields separated by white space.
|
|
* `#' at the beginning of a field begins a comment that extends to the
|
|
* end of the string. Fields may be quoted with `"'. Inside quoted
|
|
* strings, the backslash escapes `\"' and `\\' are honored.
|
|
*
|
|
* Pointers to up to the first maxfields fields are stored in the fields
|
|
* array. Missing fields get NULL pointers.
|
|
*
|
|
* The return value is the actual number of fields parsed, and is always
|
|
* <= maxfields.
|
|
*
|
|
* On a syntax error, places a message in the msg string, and returns -1.
|
|
*/
|
|
static int
|
|
split(char *str, char *fields[], int maxfields, char *msg, size_t msglen)
|
|
{
|
|
char *p;
|
|
int i;
|
|
static const char ws[] = " \t";
|
|
|
|
for (i = 0; i < maxfields; i++)
|
|
fields[i] = NULL;
|
|
p = str;
|
|
i = 0;
|
|
while (*p != '\0') {
|
|
p += strspn(p, ws);
|
|
if (*p == '#' || *p == '\0')
|
|
break;
|
|
if (i >= maxfields) {
|
|
snprintf(msg, msglen, "line has too many fields");
|
|
return -1;
|
|
}
|
|
if (*p == '"') {
|
|
char *dst;
|
|
|
|
dst = ++p;
|
|
fields[i] = dst;
|
|
while (*p != '"') {
|
|
if (*p == '\\') {
|
|
p++;
|
|
if (*p != '"' && *p != '\\' &&
|
|
*p != '\0') {
|
|
snprintf(msg, msglen,
|
|
"invalid `\\' escape");
|
|
return -1;
|
|
}
|
|
}
|
|
if (*p == '\0') {
|
|
snprintf(msg, msglen,
|
|
"unterminated quoted string");
|
|
return -1;
|
|
}
|
|
*dst++ = *p++;
|
|
}
|
|
*dst = '\0';
|
|
p++;
|
|
if (*p != '\0' && strspn(p, ws) == 0) {
|
|
snprintf(msg, msglen, "quoted string not"
|
|
" followed by white space");
|
|
return -1;
|
|
}
|
|
} else {
|
|
fields[i] = p;
|
|
p += strcspn(p, ws);
|
|
if (*p != '\0')
|
|
*p++ = '\0';
|
|
}
|
|
i++;
|
|
}
|
|
return i;
|
|
}
|
|
|
|
int
|
|
tac_add_server(struct tac_handle *h, const char *host, int port,
|
|
const char *secret, int timeout, int flags)
|
|
{
|
|
struct tac_server *srvp;
|
|
|
|
if (h->num_servers >= MAXSERVERS) {
|
|
generr(h, "Too many TACACS+ servers specified");
|
|
return -1;
|
|
}
|
|
srvp = &h->servers[h->num_servers];
|
|
|
|
memset(&srvp->addr, 0, sizeof srvp->addr);
|
|
srvp->addr.sin_len = sizeof srvp->addr;
|
|
srvp->addr.sin_family = AF_INET;
|
|
if (!inet_aton(host, &srvp->addr.sin_addr)) {
|
|
struct hostent *hent;
|
|
|
|
if ((hent = gethostbyname(host)) == NULL) {
|
|
generr(h, "%s: host not found", host);
|
|
return -1;
|
|
}
|
|
memcpy(&srvp->addr.sin_addr, hent->h_addr,
|
|
sizeof srvp->addr.sin_addr);
|
|
}
|
|
srvp->addr.sin_port = htons(port != 0 ? port : TACPLUS_PORT);
|
|
if ((srvp->secret = xstrdup(h, secret)) == NULL)
|
|
return -1;
|
|
srvp->timeout = timeout;
|
|
srvp->flags = flags;
|
|
h->num_servers++;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
tac_close(struct tac_handle *h)
|
|
{
|
|
int i, srv;
|
|
|
|
if (h->fd != -1)
|
|
close(h->fd);
|
|
for (srv = 0; srv < h->num_servers; srv++) {
|
|
memset(h->servers[srv].secret, 0,
|
|
strlen(h->servers[srv].secret));
|
|
free(h->servers[srv].secret);
|
|
}
|
|
free_str(&h->user);
|
|
free_str(&h->port);
|
|
free_str(&h->rem_addr);
|
|
free_str(&h->data);
|
|
free_str(&h->user_msg);
|
|
for (i=0; i<MAXAVPAIRS; i++)
|
|
free_str(&(h->avs[i]));
|
|
|
|
/* Clear everything else before freeing memory */
|
|
memset(h, 0, sizeof(struct tac_handle));
|
|
free(h);
|
|
}
|
|
|
|
int
|
|
tac_config(struct tac_handle *h, const char *path)
|
|
{
|
|
FILE *fp;
|
|
char buf[MAXCONFLINE];
|
|
int linenum;
|
|
int retval;
|
|
|
|
if (path == NULL)
|
|
path = PATH_TACPLUS_CONF;
|
|
if ((fp = fopen(path, "r")) == NULL) {
|
|
generr(h, "Cannot open \"%s\": %s", path, strerror(errno));
|
|
return -1;
|
|
}
|
|
retval = 0;
|
|
linenum = 0;
|
|
while (fgets(buf, sizeof buf, fp) != NULL) {
|
|
int len;
|
|
char *fields[4];
|
|
int nfields;
|
|
char msg[ERRSIZE];
|
|
char *host, *res;
|
|
char *port_str;
|
|
char *secret;
|
|
char *timeout_str;
|
|
char *options_str;
|
|
char *end;
|
|
unsigned long timeout;
|
|
int port;
|
|
int options;
|
|
|
|
linenum++;
|
|
len = strlen(buf);
|
|
/* We know len > 0, else fgets would have returned NULL. */
|
|
if (buf[len - 1] != '\n') {
|
|
if (len >= sizeof buf - 1)
|
|
generr(h, "%s:%d: line too long", path,
|
|
linenum);
|
|
else
|
|
generr(h, "%s:%d: missing newline", path,
|
|
linenum);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
buf[len - 1] = '\0';
|
|
|
|
/* Extract the fields from the line. */
|
|
nfields = split(buf, fields, 4, msg, sizeof msg);
|
|
if (nfields == -1) {
|
|
generr(h, "%s:%d: %s", path, linenum, msg);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
if (nfields == 0)
|
|
continue;
|
|
if (nfields < 2) {
|
|
generr(h, "%s:%d: missing shared secret", path,
|
|
linenum);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
host = fields[0];
|
|
secret = fields[1];
|
|
timeout_str = fields[2];
|
|
options_str = fields[3];
|
|
|
|
/* Parse and validate the fields. */
|
|
res = host;
|
|
host = strsep(&res, ":");
|
|
port_str = strsep(&res, ":");
|
|
if (port_str != NULL) {
|
|
port = strtoul(port_str, &end, 10);
|
|
if (port_str[0] == '\0' || *end != '\0') {
|
|
generr(h, "%s:%d: invalid port", path,
|
|
linenum);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
} else
|
|
port = 0;
|
|
if (timeout_str != NULL) {
|
|
timeout = strtoul(timeout_str, &end, 10);
|
|
if (timeout_str[0] == '\0' || *end != '\0') {
|
|
generr(h, "%s:%d: invalid timeout", path,
|
|
linenum);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
} else
|
|
timeout = TIMEOUT;
|
|
options = 0;
|
|
if (options_str != NULL) {
|
|
if (strcmp(options_str, "single-connection") == 0)
|
|
options |= TAC_SRVR_SINGLE_CONNECT;
|
|
else {
|
|
generr(h, "%s:%d: invalid option \"%s\"",
|
|
path, linenum, options_str);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
};
|
|
|
|
if (tac_add_server(h, host, port, secret, timeout,
|
|
options) == -1) {
|
|
char msg[ERRSIZE];
|
|
|
|
strcpy(msg, h->errmsg);
|
|
generr(h, "%s:%d: %s", path, linenum, msg);
|
|
retval = -1;
|
|
break;
|
|
}
|
|
}
|
|
/* Clear out the buffer to wipe a possible copy of a shared secret */
|
|
memset(buf, 0, sizeof buf);
|
|
fclose(fp);
|
|
return retval;
|
|
}
|
|
|
|
int
|
|
tac_create_authen(struct tac_handle *h, int action, int type, int service)
|
|
{
|
|
struct tac_authen_start *as;
|
|
|
|
create_msg(h, TAC_AUTHEN, action, type);
|
|
|
|
as = &h->request.u.authen_start;
|
|
as->action = action;
|
|
as->priv_lvl = TAC_PRIV_LVL_USER;
|
|
as->authen_type = type;
|
|
as->service = service;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tac_create_author(struct tac_handle *h, int method, int type, int service)
|
|
{
|
|
struct tac_author_request *areq;
|
|
|
|
create_msg(h, TAC_AUTHOR, method, type);
|
|
|
|
areq = &h->request.u.author_request;
|
|
areq->authen_meth = method;
|
|
areq->priv_lvl = TAC_PRIV_LVL_USER;
|
|
areq->authen_type = type;
|
|
areq->service = service;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tac_create_acct(struct tac_handle *h, int acct, int action, int type, int service)
|
|
{
|
|
struct tac_acct_start *as;
|
|
|
|
create_msg(h, TAC_ACCT, action, type);
|
|
|
|
as = &h->request.u.acct_start;
|
|
as->action = acct;
|
|
as->authen_action = action;
|
|
as->priv_lvl = TAC_PRIV_LVL_USER;
|
|
as->authen_type = type;
|
|
as->authen_service = service;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
create_msg(struct tac_handle *h, int msg_type, int var, int type)
|
|
{
|
|
struct tac_msg *msg;
|
|
int i;
|
|
|
|
h->last_seq_no = 0;
|
|
|
|
msg = &h->request;
|
|
msg->type = msg_type;
|
|
msg->version = protocol_version(msg_type, var, type);
|
|
msg->flags = 0; /* encrypted packet body */
|
|
|
|
free_str(&h->user);
|
|
free_str(&h->port);
|
|
free_str(&h->rem_addr);
|
|
free_str(&h->data);
|
|
free_str(&h->user_msg);
|
|
|
|
for (i=0; i<MAXAVPAIRS; i++)
|
|
free_str(&(h->avs[i]));
|
|
}
|
|
|
|
void *
|
|
tac_get_data(struct tac_handle *h, size_t *len)
|
|
{
|
|
return dup_str(h, &h->srvr_data, len);
|
|
}
|
|
|
|
char *
|
|
tac_get_msg(struct tac_handle *h)
|
|
{
|
|
return dup_str(h, &h->srvr_msg, NULL);
|
|
}
|
|
|
|
/*
|
|
* Create and initialize a tac_handle structure, and return it to the
|
|
* caller. Can fail only if the necessary memory cannot be allocated.
|
|
* In that case, it returns NULL.
|
|
*/
|
|
struct tac_handle *
|
|
tac_open(void)
|
|
{
|
|
int i;
|
|
struct tac_handle *h;
|
|
|
|
h = (struct tac_handle *)malloc(sizeof(struct tac_handle));
|
|
if (h != NULL) {
|
|
h->fd = -1;
|
|
h->num_servers = 0;
|
|
h->cur_server = 0;
|
|
h->errmsg[0] = '\0';
|
|
init_clnt_str(&h->user);
|
|
init_clnt_str(&h->port);
|
|
init_clnt_str(&h->rem_addr);
|
|
init_clnt_str(&h->data);
|
|
init_clnt_str(&h->user_msg);
|
|
for (i=0; i<MAXAVPAIRS; i++) {
|
|
init_clnt_str(&(h->avs[i]));
|
|
init_srvr_str(&(h->srvr_avs[i]));
|
|
}
|
|
init_srvr_str(&h->srvr_msg);
|
|
init_srvr_str(&h->srvr_data);
|
|
}
|
|
return h;
|
|
}
|
|
|
|
int
|
|
tac_send_authen(struct tac_handle *h)
|
|
{
|
|
struct tac_authen_reply *ar;
|
|
|
|
if (h->num_servers == 0)
|
|
return -1;
|
|
|
|
if (h->last_seq_no == 0) { /* Authentication START packet */
|
|
struct tac_authen_start *as;
|
|
|
|
as = &h->request.u.authen_start;
|
|
h->request.length =
|
|
htonl(offsetof(struct tac_authen_start, rest[0]));
|
|
if (add_str_8(h, &as->user_len, &h->user) == -1 ||
|
|
add_str_8(h, &as->port_len, &h->port) == -1 ||
|
|
add_str_8(h, &as->rem_addr_len, &h->rem_addr) == -1 ||
|
|
add_str_8(h, &as->data_len, &h->data) == -1)
|
|
return -1;
|
|
} else { /* Authentication CONTINUE packet */
|
|
struct tac_authen_cont *ac;
|
|
|
|
ac = &h->request.u.authen_cont;
|
|
ac->flags = 0;
|
|
h->request.length =
|
|
htonl(offsetof(struct tac_authen_cont, rest[0]));
|
|
if (add_str_16(h, &ac->user_msg_len, &h->user_msg) == -1 ||
|
|
add_str_16(h, &ac->data_len, &h->data) == -1)
|
|
return -1;
|
|
}
|
|
|
|
/* Send the message and retrieve the reply. */
|
|
if (send_msg(h) == -1 || recv_msg(h) == -1)
|
|
return -1;
|
|
|
|
/* Scan the optional fields in the reply. */
|
|
ar = &h->response.u.authen_reply;
|
|
h->srvr_pos = offsetof(struct tac_authen_reply, rest[0]);
|
|
if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 ||
|
|
get_srvr_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 ||
|
|
get_srvr_end(h) == -1)
|
|
return -1;
|
|
|
|
if (!h->single_connect &&
|
|
ar->status != TAC_AUTHEN_STATUS_GETDATA &&
|
|
ar->status != TAC_AUTHEN_STATUS_GETUSER &&
|
|
ar->status != TAC_AUTHEN_STATUS_GETPASS)
|
|
close_connection(h);
|
|
|
|
return ar->flags << 8 | ar->status;
|
|
}
|
|
|
|
int
|
|
tac_send_author(struct tac_handle *h)
|
|
{
|
|
int i, current;
|
|
char dbgstr[64];
|
|
struct tac_author_request *areq = &h->request.u.author_request;
|
|
struct tac_author_response *ares = &h->response.u.author_response;
|
|
|
|
h->request.length =
|
|
htonl(offsetof(struct tac_author_request, rest[0]));
|
|
|
|
/* Count each specified AV pair */
|
|
for (areq->av_cnt=0, i=0; i<MAXAVPAIRS; i++)
|
|
if (h->avs[i].len && h->avs[i].data)
|
|
areq->av_cnt++;
|
|
|
|
/*
|
|
* Each AV size is a byte starting right after 'av_cnt'. Update the
|
|
* offset to include these AV sizes.
|
|
*/
|
|
h->request.length = ntohl(htonl(h->request.length) + areq->av_cnt);
|
|
|
|
/* Now add the string arguments from 'h' */
|
|
if (add_str_8(h, &areq->user_len, &h->user) == -1 ||
|
|
add_str_8(h, &areq->port_len, &h->port) == -1 ||
|
|
add_str_8(h, &areq->rem_addr_len, &h->rem_addr) == -1)
|
|
return -1;
|
|
|
|
/* Add each AV pair, the size of each placed in areq->rest[current] */
|
|
for (current=0, i=0; i<MAXAVPAIRS; i++) {
|
|
if (h->avs[i].len && h->avs[i].data) {
|
|
if (add_str_8(h, &areq->rest[current++],
|
|
&(h->avs[i])) == -1)
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/* Send the message and retrieve the reply. */
|
|
if (send_msg(h) == -1 || recv_msg(h) == -1)
|
|
return -1;
|
|
|
|
/* Update the offset in the response packet based on av pairs count */
|
|
h->srvr_pos = offsetof(struct tac_author_response, rest[0]) +
|
|
ares->av_cnt;
|
|
|
|
/* Scan the optional fields in the response. */
|
|
if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ares->msg_len)) == -1 ||
|
|
get_srvr_str(h, "data", &h->srvr_data, ntohs(ares->data_len)) ==-1)
|
|
return -1;
|
|
|
|
/* Get each AV pair (just setting pointers, not malloc'ing) */
|
|
clear_srvr_avs(h);
|
|
for (i=0; i<ares->av_cnt; i++) {
|
|
snprintf(dbgstr, sizeof dbgstr, "av-pair-%d", i);
|
|
if (get_srvr_str(h, dbgstr, &(h->srvr_avs[i]),
|
|
ares->rest[i]) == -1)
|
|
return -1;
|
|
}
|
|
|
|
/* Should have ended up at the end */
|
|
if (get_srvr_end(h) == -1)
|
|
return -1;
|
|
|
|
/* Sanity checks */
|
|
if (!h->single_connect)
|
|
close_connection(h);
|
|
|
|
return ares->av_cnt << 8 | ares->status;
|
|
}
|
|
|
|
int
|
|
tac_send_acct(struct tac_handle *h)
|
|
{
|
|
register int i, current;
|
|
struct tac_acct_start *as = &h->request.u.acct_start;
|
|
struct tac_acct_reply *ar = &h->response.u.acct_reply;
|
|
|
|
/* start */
|
|
as = &h->request.u.acct_start;
|
|
h->request.length = htonl(offsetof(struct tac_acct_start, rest[0]));
|
|
for (as->av_cnt = 0, i = 0; i < MAXAVPAIRS; i++)
|
|
if (h->avs[i].len && h->avs[i].data)
|
|
as->av_cnt++;
|
|
h->request.length = ntohl(htonl(h->request.length) + as->av_cnt);
|
|
|
|
if (add_str_8(h, &as->user_len, &h->user) == -1 ||
|
|
add_str_8(h, &as->port_len, &h->port) == -1 ||
|
|
add_str_8(h, &as->rem_addr_len, &h->rem_addr) == -1)
|
|
return -1;
|
|
|
|
for (i = current = 0; i < MAXAVPAIRS; i++)
|
|
if (h->avs[i].len && h->avs[i].data)
|
|
if (add_str_8(h, &as->rest[current++], &(h->avs[i])) == -1)
|
|
return -1;
|
|
|
|
/* send */
|
|
if (send_msg(h) == -1 || recv_msg(h) == -1)
|
|
return -1;
|
|
|
|
/* reply */
|
|
h->srvr_pos = offsetof(struct tac_acct_reply, rest[0]);
|
|
if (get_srvr_str(h, "msg", &h->srvr_msg, ntohs(ar->msg_len)) == -1 ||
|
|
get_srvr_str(h, "data", &h->srvr_data, ntohs(ar->data_len)) == -1 ||
|
|
get_srvr_end(h) == -1)
|
|
return -1;
|
|
|
|
/* Sanity checks */
|
|
if (!h->single_connect)
|
|
close_connection(h);
|
|
|
|
return ar->status;
|
|
}
|
|
|
|
int
|
|
tac_set_rem_addr(struct tac_handle *h, const char *addr)
|
|
{
|
|
return save_str(h, &h->rem_addr, addr, addr != NULL ? strlen(addr) : 0);
|
|
}
|
|
|
|
int
|
|
tac_set_data(struct tac_handle *h, const void *data, size_t data_len)
|
|
{
|
|
return save_str(h, &h->data, data, data_len);
|
|
}
|
|
|
|
int
|
|
tac_set_msg(struct tac_handle *h, const char *msg)
|
|
{
|
|
return save_str(h, &h->user_msg, msg, msg != NULL ? strlen(msg) : 0);
|
|
}
|
|
|
|
int
|
|
tac_set_port(struct tac_handle *h, const char *port)
|
|
{
|
|
return save_str(h, &h->port, port, port != NULL ? strlen(port) : 0);
|
|
}
|
|
|
|
int
|
|
tac_set_priv(struct tac_handle *h, int priv)
|
|
{
|
|
if (!(TAC_PRIV_LVL_MIN <= priv && priv <= TAC_PRIV_LVL_MAX)) {
|
|
generr(h, "Attempt to set invalid privilege level");
|
|
return -1;
|
|
}
|
|
h->request.u.authen_start.priv_lvl = priv;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
tac_set_user(struct tac_handle *h, const char *user)
|
|
{
|
|
return save_str(h, &h->user, user, user != NULL ? strlen(user) : 0);
|
|
}
|
|
|
|
int
|
|
tac_set_av(struct tac_handle *h, u_int index, const char *av)
|
|
{
|
|
if (index >= MAXAVPAIRS)
|
|
return -1;
|
|
return save_str(h, &(h->avs[index]), av, av != NULL ? strlen(av) : 0);
|
|
}
|
|
|
|
char *
|
|
tac_get_av(struct tac_handle *h, u_int index)
|
|
{
|
|
if (index >= MAXAVPAIRS)
|
|
return NULL;
|
|
return dup_str(h, &(h->srvr_avs[index]), NULL);
|
|
}
|
|
|
|
char *
|
|
tac_get_av_value(struct tac_handle *h, const char *attribute)
|
|
{
|
|
int i, len;
|
|
const char *ch, *end;
|
|
const char *candidate;
|
|
int candidate_len;
|
|
int found_seperator;
|
|
struct srvr_str srvr;
|
|
|
|
if (attribute == NULL || ((len = strlen(attribute)) == 0))
|
|
return NULL;
|
|
|
|
for (i=0; i<MAXAVPAIRS; i++) {
|
|
candidate = h->srvr_avs[i].data;
|
|
candidate_len = h->srvr_avs[i].len;
|
|
|
|
/*
|
|
* Valid 'srvr_avs' guaranteed to be contiguous starting at
|
|
* index 0 (not necessarily the case with 'avs'). Break out
|
|
* when the "end" of the list has been reached.
|
|
*/
|
|
if (!candidate)
|
|
break;
|
|
|
|
if (len < candidate_len &&
|
|
!strncmp(candidate, attribute, len)) {
|
|
|
|
ch = candidate + len;
|
|
end = candidate + candidate_len;
|
|
|
|
/*
|
|
* Sift out the white space between A and V (should not
|
|
* be any, but don't trust implementation of server...)
|
|
*/
|
|
found_seperator = 0;
|
|
while ((*ch == '=' || *ch == '*' || *ch == ' ' ||
|
|
*ch == '\t') && ch != end) {
|
|
if (*ch == '=' || *ch == '*')
|
|
found_seperator++;
|
|
ch++;
|
|
}
|
|
|
|
/*
|
|
* Note:
|
|
* The case of 'attribute' == "foo" and
|
|
* h->srvr_avs[0] = "foobie=var1"
|
|
* h->srvr_avs[1] = "foo=var2"
|
|
* is handled.
|
|
*
|
|
* Note that for empty string attribute values a
|
|
* 0-length string is returned in order to distinguish
|
|
* against unset values.
|
|
* dup_str() will handle srvr.len == 0 correctly.
|
|
*/
|
|
if (found_seperator == 1) {
|
|
srvr.len = end - ch;
|
|
srvr.data = ch;
|
|
return dup_str(h, &srvr, NULL);
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void
|
|
tac_clear_avs(struct tac_handle *h)
|
|
{
|
|
int i;
|
|
for (i=0; i<MAXAVPAIRS; i++)
|
|
save_str(h, &(h->avs[i]), NULL, 0);
|
|
}
|
|
|
|
static void
|
|
clear_srvr_avs(struct tac_handle *h)
|
|
{
|
|
int i;
|
|
for (i=0; i<MAXAVPAIRS; i++)
|
|
init_srvr_str(&(h->srvr_avs[i]));
|
|
}
|
|
|
|
|
|
const char *
|
|
tac_strerror(struct tac_handle *h)
|
|
{
|
|
return h->errmsg;
|
|
}
|
|
|
|
static void *
|
|
xmalloc(struct tac_handle *h, size_t size)
|
|
{
|
|
void *r;
|
|
|
|
if ((r = malloc(size)) == NULL)
|
|
generr(h, "Out of memory");
|
|
return r;
|
|
}
|
|
|
|
static char *
|
|
xstrdup(struct tac_handle *h, const char *s)
|
|
{
|
|
char *r;
|
|
|
|
if ((r = strdup(s)) == NULL)
|
|
generr(h, "Out of memory");
|
|
return r;
|
|
}
|