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1 office 1 /* source: xio-tcpwrap.c */
2 /* Copyright Gerhard Rieger 2006-2009 */
3 /* Published under the GNU General Public License V.2, see file COPYING */
4  
5 /* this file contains the source for tcpwrapper handling stuff */
6  
7 #include "xiosysincludes.h"
8 #if WITH_LIBWRAP
9 #include "tcpd.h"
10 #endif
11 #include "xioopen.h"
12  
13 #include "xio-tcpwrap.h"
14  
15  
16 #if (WITH_TCP || WITH_UDP) && WITH_LIBWRAP
17  
18 const struct optdesc opt_tcpwrappers = { "tcpwrappers", "tcpwrap", OPT_TCPWRAPPERS, GROUP_RANGE, PH_ACCEPT, TYPE_STRING_NULL, OFUNC_SPEC };
19 const struct optdesc opt_tcpwrap_etc = { "tcpwrap-etc", "tcpwrap-dir", OPT_TCPWRAP_ETC, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
20 #if defined(HAVE_HOSTS_ALLOW_TABLE)
21 const struct optdesc opt_tcpwrap_hosts_allow_table = { "tcpwrap-hosts-allow-table", "allow-table", OPT_TCPWRAP_HOSTS_ALLOW_TABLE, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
22 #endif
23 #if defined(HAVE_HOSTS_DENY_TABLE)
24 const struct optdesc opt_tcpwrap_hosts_deny_table = { "tcpwrap-hosts-deny-table", "deny-table", OPT_TCPWRAP_HOSTS_DENY_TABLE, GROUP_RANGE, PH_ACCEPT, TYPE_FILENAME, OFUNC_SPEC };
25 #endif
26  
27  
28 /* they are declared only externally with libwrap and would be unresolved
29 without these definitions */
30 int allow_severity=10, deny_severity=10;
31  
32 /* returns 0 if option was found and could be applied
33 returns 1 if option was not found
34 returns -1 if option was found but failed */
35 int xio_retropt_tcpwrap(xiosingle_t *xfd, struct opt *opts) {
36 bool dolibwrap = false;
37 dolibwrap =
38 retropt_string(opts, OPT_TCPWRAPPERS,
39 &xfd->para.socket.ip.libwrapname) >= 0 || dolibwrap;
40 dolibwrap =
41 retropt_string(opts, OPT_TCPWRAP_ETC,
42 &xfd->para.socket.ip.tcpwrap_etc) >= 0 || dolibwrap;
43 #if defined(HAVE_HOSTS_ALLOW_TABLE)
44 dolibwrap =
45 retropt_string(opts, OPT_TCPWRAP_HOSTS_ALLOW_TABLE,
46 &xfd->para.socket.ip.hosts_allow_table) >= 0 || dolibwrap;
47 #endif
48 #if defined(HAVE_HOSTS_DENY_TABLE)
49 dolibwrap =
50 retropt_string(opts, OPT_TCPWRAP_HOSTS_DENY_TABLE,
51 &xfd->para.socket.ip.hosts_deny_table) >= 0 || dolibwrap;
52 #endif
53 if (dolibwrap) {
54 xfd->para.socket.ip.dolibwrap = true;
55 if (xfd->para.socket.ip.libwrapname == NULL) {
56 xfd->para.socket.ip.libwrapname = (char *)diag_get_string('p');
57 }
58 #if defined(HAVE_HOSTS_ALLOW_TABLE) || defined(HAVE_HOSTS_DENY_TABLE)
59 if (xfd->para.socket.ip.tcpwrap_etc) {
60 if (xfd->para.socket.ip.hosts_allow_table == NULL) {
61 xfd->para.socket.ip.hosts_allow_table =
62 Malloc(strlen(xfd->para.socket.ip.tcpwrap_etc)+1+11+1);
63 sprintf(xfd->para.socket.ip.hosts_allow_table, "%s/hosts.allow",
64 xfd->para.socket.ip.tcpwrap_etc);
65 }
66 if (xfd->para.socket.ip.hosts_deny_table == NULL) {
67 xfd->para.socket.ip.hosts_deny_table =
68 Malloc(strlen(xfd->para.socket.ip.tcpwrap_etc)+1+10+1);
69 sprintf(xfd->para.socket.ip.hosts_deny_table, "%s/hosts.deny",
70 xfd->para.socket.ip.tcpwrap_etc);
71 }
72 }
73 #endif /* defined(HAVE_HOSTS_ALLOW_TABLE) || defined(HAVE_HOSTS_DENY_TABLE) */
74 return 0;
75 }
76 return 1;
77 }
78  
79  
80 /* returns -1 if forbidden, 0 if no tcpwrap check, or 1 if explicitely allowed
81 */
82 int xio_tcpwrap_check(xiosingle_t *xfd, union sockaddr_union *us,
83 union sockaddr_union *them) {
84 char *save_hosts_allow_table, *save_hosts_deny_table;
85 struct request_info ri;
86 #if WITH_IP6
87 char clientaddr[INET6_ADDRSTRLEN] = "", serveraddr[INET6_ADDRSTRLEN] = "";
88 #else
89 char clientaddr[INET_ADDRSTRLEN] = "", serveraddr[INET_ADDRSTRLEN] = "";
90 #endif
91 int allow;
92  
93 if (!xfd->para.socket.ip.dolibwrap) {
94 return 0;
95 }
96 if (us == NULL || them == NULL) { return -1; }
97  
98 #if defined(HAVE_HOSTS_ALLOW_TABLE)
99 save_hosts_allow_table = hosts_allow_table;
100 if (xfd->para.socket.ip.hosts_allow_table) {
101 Debug1("hosts_allow_table = \"%s\"",
102 xfd->para.socket.ip.hosts_allow_table);
103 hosts_allow_table = xfd->para.socket.ip.hosts_allow_table;
104 }
105 #endif /* defined(HAVE_HOSTS_ALLOW_TABLE) */
106 #if defined(HAVE_HOSTS_DENY_TABLE)
107 save_hosts_deny_table = hosts_deny_table;
108 if (xfd->para.socket.ip.hosts_deny_table) {
109 Debug1("hosts_deny_table = \"%s\"",
110 xfd->para.socket.ip.hosts_deny_table);
111 hosts_deny_table = xfd->para.socket.ip.hosts_deny_table;
112 }
113 #endif /* defined(HAVE_HOSTS_DENY_TABLE) */
114  
115 hosts_access_verbose = 32767;
116 if (inet_ntop(them->soa.sa_family,
117 #if WITH_IP6
118 them->soa.sa_family==PF_INET6 ?
119 (void *)&them->ip6.sin6_addr :
120 #endif
121 (void *)&them->ip4.sin_addr,
122 clientaddr, sizeof(clientaddr)) == NULL) {
123 Warn1("inet_ntop(): %s", strerror(errno));
124 }
125 if (inet_ntop(us->soa.sa_family,
126 #if WITH_IP6
127 us->soa.sa_family==PF_INET6 ?
128 (void *)&us->ip6.sin6_addr :
129 #endif
130 (void *)&us->ip4.sin_addr,
131 serveraddr, sizeof(serveraddr)) == NULL) {
132 Warn1("inet_ntop(): %s", strerror(errno));
133 }
134 Debug7("request_init(%p, RQ_FILE, %d, RQ_CLIENT_SIN, {%s:%u}, RQ_SERVER_SIN, {%s:%u}, RQ_DAEMON, \"%s\", 0",
135 &ri, xfd->rfd, clientaddr,
136 ntohs(((struct sockaddr_in *)them)->sin_port),
137 serveraddr, ntohs(us->ip4.sin_port),
138 xfd->para.socket.ip.libwrapname?xfd->para.socket.ip.libwrapname:(char *)diag_get_string('p'));
139 request_init(&ri, RQ_FILE, xfd->rfd,
140 RQ_CLIENT_SIN, them,
141 RQ_SERVER_SIN, &us->soa,
142 RQ_DAEMON, xfd->para.socket.ip.libwrapname?xfd->para.socket.ip.libwrapname:(char *)diag_get_string('p'), 0);
143 Debug("request_init() ->");
144  
145 Debug1("sock_methods(%p)", &ri);
146 sock_methods(&ri);
147 Debug("sock_methods() ->");
148  
149 Debug1("hosts_access(%p)", &ri);
150 allow = hosts_access(&ri);
151 Debug1("hosts_access() -> %d", allow);
152  
153 #if defined(HAVE_HOSTS_ALLOW_TABLE)
154 hosts_allow_table = save_hosts_allow_table;
155 #endif
156 #if defined(HAVE_HOSTS_DENY_TABLE)
157 hosts_deny_table = save_hosts_deny_table;
158 #endif
159 if (allow == 0) {
160 return -1;
161 }
162 return 1;
163 }
164  
165 #endif /* (WITH_TCP || WITH_UDP) && WITH_LIBWRAP */
166