amq_svc.c revision 174294 
1/*
2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgment:
21 *      This product includes software developed by the University of
22 *      California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 *    may be used to endorse or promote products derived from this software
25 *    without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 * SUCH DAMAGE.
38 *
39 *
40 * File: am-utils/amd/amq_svc.c
41 *
42 */
43
44#ifdef HAVE_CONFIG_H
45# include <config.h>
46#endif /* HAVE_CONFIG_H */
47#include <am_defs.h>
48#include <amd.h>
49
50/* typedefs */
51typedef char *(*amqsvcproc_t)(voidp, struct svc_req *);
52
53#if defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP)
54# ifdef NEED_LIBWRAP_SEVERITY_VARIABLES
55/*
56 * Some systems that define libwrap already define these two variables
57 * in libwrap, while others don't: so I need to know precisely iff
58 * to define these two severity variables.
59 */
60int allow_severity=0, deny_severity=0;
61# endif /* NEED_LIBWRAP_SEVERITY_VARIABLES */
62
63/*
64 * check if remote amq is authorized to access this amd.
65 * Returns: 1=allowed, 0=denied.
66 */
67static int
68amqsvc_is_client_allowed(const struct sockaddr_in *addr, char *remote)
69{
70  struct hostent *h;
71  char *name = NULL, **ad;
72  int ret = 0;			/* default is 0==denied */
73
74  /* Check IP address */
75  if (hosts_ctl(AMD_SERVICE_NAME, "", remote, "")) {
76    ret = 1;
77    goto out;
78  }
79  /* Get address */
80  if (!(h = gethostbyaddr((const char *)&(addr->sin_addr),
81                          sizeof(addr->sin_addr),
82                          AF_INET)))
83    goto out;
84  if (!(name = strdup(h->h_name)))
85    goto out;
86  /* Paranoia check */
87  if (!(h = gethostbyname(name)))
88    goto out;
89  for (ad = h->h_addr_list; *ad; ad++)
90    if (!memcmp(*ad, &(addr->sin_addr), h->h_length))
91      break;
92  if (!*ad)
93    goto out;
94  if (hosts_ctl(AMD_SERVICE_NAME, "", h->h_name, "")) {
95    return 1;
96    goto out;
97  }
98  /* Check aliases */
99  for (ad = h->h_aliases; *ad; ad++)
100    if (hosts_ctl(AMD_SERVICE_NAME, "", *ad, "")) {
101      return 1;
102      goto out;
103    }
104
105 out:
106  if (name)
107    XFREE(name);
108  return ret;
109}
110#endif /* defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP) */
111
112
113void
114amq_program_1(struct svc_req *rqstp, SVCXPRT *transp)
115{
116  union {
117    amq_string amqproc_mnttree_1_arg;
118    amq_string amqproc_umnt_1_arg;
119    amq_setopt amqproc_setopt_1_arg;
120  } argument;
121  char *result;
122  xdrproc_t xdr_argument, xdr_result;
123  amqsvcproc_t local;
124
125#if defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP)
126  if (gopt.flags & CFM_USE_TCPWRAPPERS) {
127    struct sockaddr_in *remote_addr = svc_getcaller(rqstp->rq_xprt);
128    char *remote_hostname = inet_ntoa(remote_addr->sin_addr);
129
130    if (!amqsvc_is_client_allowed(remote_addr, remote_hostname)) {
131      plog(XLOG_WARNING, "Amd denied remote amq service to %s", remote_hostname);
132      svcerr_auth(transp, AUTH_FAILED);
133      return;
134    } else {
135      dlog("Amd allowed remote amq service to %s", remote_hostname);
136    }
137  }
138#endif /* defined(HAVE_TCPD_H) && defined(HAVE_LIBWRAP) */
139
140  switch (rqstp->rq_proc) {
141
142  case AMQPROC_NULL:
143    xdr_argument = (xdrproc_t) xdr_void;
144    xdr_result = (xdrproc_t) xdr_void;
145    local = (amqsvcproc_t) amqproc_null_1_svc;
146    break;
147
148  case AMQPROC_MNTTREE:
149    xdr_argument = (xdrproc_t) xdr_amq_string;
150    xdr_result = (xdrproc_t) xdr_amq_mount_tree_p;
151    local = (amqsvcproc_t) amqproc_mnttree_1_svc;
152    break;
153
154  case AMQPROC_UMNT:
155    xdr_argument = (xdrproc_t) xdr_amq_string;
156    xdr_result = (xdrproc_t) xdr_void;
157    local = (amqsvcproc_t) amqproc_umnt_1_svc;
158    break;
159
160  case AMQPROC_STATS:
161    xdr_argument = (xdrproc_t) xdr_void;
162    xdr_result = (xdrproc_t) xdr_amq_mount_stats;
163    local = (amqsvcproc_t) amqproc_stats_1_svc;
164    break;
165
166  case AMQPROC_EXPORT:
167    xdr_argument = (xdrproc_t) xdr_void;
168    xdr_result = (xdrproc_t) xdr_amq_mount_tree_list;
169    local = (amqsvcproc_t) amqproc_export_1_svc;
170    break;
171
172  case AMQPROC_SETOPT:
173    xdr_argument = (xdrproc_t) xdr_amq_setopt;
174    xdr_result = (xdrproc_t) xdr_int;
175    local = (amqsvcproc_t) amqproc_setopt_1_svc;
176    break;
177
178  case AMQPROC_GETMNTFS:
179    xdr_argument = (xdrproc_t) xdr_void;
180    xdr_result = (xdrproc_t) xdr_amq_mount_info_qelem;
181    local = (amqsvcproc_t) amqproc_getmntfs_1_svc;
182    break;
183
184  case AMQPROC_GETVERS:
185    xdr_argument = (xdrproc_t) xdr_void;
186    xdr_result = (xdrproc_t) xdr_amq_string;
187    local = (amqsvcproc_t) amqproc_getvers_1_svc;
188    break;
189
190  case AMQPROC_GETPID:
191    xdr_argument = (xdrproc_t) xdr_void;
192    xdr_result = (xdrproc_t) xdr_int;
193    local = (amqsvcproc_t) amqproc_getpid_1_svc;
194    break;
195
196  case AMQPROC_PAWD:
197    xdr_argument = (xdrproc_t) xdr_amq_string;
198    xdr_result = (xdrproc_t) xdr_amq_string;
199    local = (amqsvcproc_t) amqproc_pawd_1_svc;
200    break;
201
202  default:
203    svcerr_noproc(transp);
204    return;
205  }
206
207  memset((char *) &argument, 0, sizeof(argument));
208  if (!svc_getargs(transp,
209		   (XDRPROC_T_TYPE) xdr_argument,
210		   (SVC_IN_ARG_TYPE) & argument)) {
211    svcerr_decode(transp);
212    return;
213  }
214
215  result = (*local) (&argument, rqstp);
216
217  if (result != NULL && !svc_sendreply(transp,
218				       (XDRPROC_T_TYPE) xdr_result,
219				       result)) {
220    svcerr_systemerr(transp);
221  }
222
223  if (!svc_freeargs(transp,
224		    (XDRPROC_T_TYPE) xdr_argument,
225		    (SVC_IN_ARG_TYPE) & argument)) {
226    plog(XLOG_FATAL, "unable to free rpc arguments in amqprog_1");
227    going_down(1);
228  }
229}
230