| socket.c (44744) | socket.c (56977) |
|---|---|
| 1 /* 2 * This module determines the type of socket (datagram, stream), the client 3 * socket address and port, the server socket address and port. In addition, 4 * it provides methods to map a transport address to a printable host name 5 * or address. Socket address information results are in static memory. 6 * 7 * The result from the hostname lookup method is STRING_PARANOID when a host 8 * pretends to have someone elses name, or when a host name is available but 9 * could not be verified. 10 * 11 * When lookup or conversion fails the result is set to STRING_UNKNOWN. 12 * 13 * Diagnostics are reported through syslog(3). 14 * 15 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. | 1 /* 2 * This module determines the type of socket (datagram, stream), the client 3 * socket address and port, the server socket address and port. In addition, 4 * it provides methods to map a transport address to a printable host name 5 * or address. Socket address information results are in static memory. 6 * 7 * The result from the hostname lookup method is STRING_PARANOID when a host 8 * pretends to have someone elses name, or when a host name is available but 9 * could not be verified. 10 * 11 * When lookup or conversion fails the result is set to STRING_UNKNOWN. 12 * 13 * Diagnostics are reported through syslog(3). 14 * 15 * Author: Wietse Venema, Eindhoven University of Technology, The Netherlands. |
| 16 * 17 * $FreeBSD: head/contrib/tcp_wrappers/socket.c 56977 2000-02-03 10:27:03Z shin $ |
|
| 16 */ 17 18#ifndef lint 19static char sccsid[] = "@(#) socket.c 1.15 97/03/21 19:27:24"; 20#endif 21 22/* System libraries. */ 23 24#include <sys/types.h> 25#include <sys/param.h> 26#include <sys/socket.h> 27#include <netinet/in.h> 28#include <netdb.h> 29#include <stdio.h> 30#include <syslog.h> 31#include <string.h> 32 | 18 */ 19 20#ifndef lint 21static char sccsid[] = "@(#) socket.c 1.15 97/03/21 19:27:24"; 22#endif 23 24/* System libraries. */ 25 26#include <sys/types.h> 27#include <sys/param.h> 28#include <sys/socket.h> 29#include <netinet/in.h> 30#include <netdb.h> 31#include <stdio.h> 32#include <syslog.h> 33#include <string.h> 34 |
| 35#ifdef INET6 36#ifndef USE_GETIPNODEBY 37#include <resolv.h> 38#endif 39#endif 40 |
|
| 33extern char *inet_ntoa(); 34 35/* Local stuff. */ 36 37#include "tcpd.h" 38 39/* Forward declarations. */ 40 --- 28 unchanged lines hidden (view full) --- 69#define gethostbyname gethostbyname_dot 70#endif 71 72/* sock_host - look up endpoint addresses and install conversion methods */ 73 74void sock_host(request) 75struct request_info *request; 76{ | 41extern char *inet_ntoa(); 42 43/* Local stuff. */ 44 45#include "tcpd.h" 46 47/* Forward declarations. */ 48 --- 28 unchanged lines hidden (view full) --- 77#define gethostbyname gethostbyname_dot 78#endif 79 80/* sock_host - look up endpoint addresses and install conversion methods */ 81 82void sock_host(request) 83struct request_info *request; 84{ |
| 85#ifdef INET6 86 static struct sockaddr_storage client; 87 static struct sockaddr_storage server; 88#else |
|
| 77 static struct sockaddr_in client; 78 static struct sockaddr_in server; | 89 static struct sockaddr_in client; 90 static struct sockaddr_in server; |
| 91#endif |
|
| 79 int len; 80 char buf[BUFSIZ]; 81 int fd = request->fd; 82 83 sock_methods(request); 84 85 /* 86 * Look up the client host address. Hal R. Brand <BRAND@addvax.llnl.gov> --- 12 unchanged lines hidden (view full) --- 99 (struct sockaddr *) & client, &len) < 0) { 100 tcpd_warn("can't get client address: %m"); 101 return; /* give up */ 102 } 103#ifdef really_paranoid 104 memset(buf, 0 sizeof(buf)); 105#endif 106 } | 92 int len; 93 char buf[BUFSIZ]; 94 int fd = request->fd; 95 96 sock_methods(request); 97 98 /* 99 * Look up the client host address. Hal R. Brand <BRAND@addvax.llnl.gov> --- 12 unchanged lines hidden (view full) --- 112 (struct sockaddr *) & client, &len) < 0) { 113 tcpd_warn("can't get client address: %m"); 114 return; /* give up */ 115 } 116#ifdef really_paranoid 117 memset(buf, 0 sizeof(buf)); 118#endif 119 } |
| 120#ifdef INET6 121 request->client->sin = (struct sockaddr *)&client; 122#else |
|
| 107 request->client->sin = &client; | 123 request->client->sin = &client; |
| 124#endif |
|
| 108 109 /* 110 * Determine the server binding. This is used for client username 111 * lookups, and for access control rules that trigger on the server 112 * address or name. 113 */ 114 115 len = sizeof(server); 116 if (getsockname(fd, (struct sockaddr *) & server, &len) < 0) { 117 tcpd_warn("getsockname: %m"); 118 return; 119 } | 125 126 /* 127 * Determine the server binding. This is used for client username 128 * lookups, and for access control rules that trigger on the server 129 * address or name. 130 */ 131 132 len = sizeof(server); 133 if (getsockname(fd, (struct sockaddr *) & server, &len) < 0) { 134 tcpd_warn("getsockname: %m"); 135 return; 136 } |
| 137#ifdef INET6 138 request->server->sin = (struct sockaddr *)&server; 139#else |
|
| 120 request->server->sin = &server; | 140 request->server->sin = &server; |
| 141#endif |
|
| 121} 122 123/* sock_hostaddr - map endpoint address to printable form */ 124 125void sock_hostaddr(host) 126struct host_info *host; 127{ | 142} 143 144/* sock_hostaddr - map endpoint address to printable form */ 145 146void sock_hostaddr(host) 147struct host_info *host; 148{ |
| 149#ifdef INET6 150 struct sockaddr *sin = host->sin; 151 char *ap; 152 int alen; 153 154 if (!sin) 155 return; 156 switch (sin->sa_family) { 157 case AF_INET: 158 ap = (char *)&((struct sockaddr_in *)sin)->sin_addr; 159 alen = sizeof(struct in_addr); 160 break; 161 case AF_INET6: 162 ap = (char *)&((struct sockaddr_in6 *)sin)->sin6_addr; 163 alen = sizeof(struct in6_addr); 164 break; 165 default: 166 return; 167 } 168 host->addr[0] = '\0'; 169 inet_ntop(sin->sa_family, ap, host->addr, sizeof(host->addr)); 170#else |
|
| 128 struct sockaddr_in *sin = host->sin; 129 130 if (sin != 0) 131 STRN_CPY(host->addr, inet_ntoa(sin->sin_addr), sizeof(host->addr)); | 171 struct sockaddr_in *sin = host->sin; 172 173 if (sin != 0) 174 STRN_CPY(host->addr, inet_ntoa(sin->sin_addr), sizeof(host->addr)); |
| 175#endif |
|
| 132} 133 134/* sock_hostname - map endpoint address to host name */ 135 136void sock_hostname(host) 137struct host_info *host; 138{ | 176} 177 178/* sock_hostname - map endpoint address to host name */ 179 180void sock_hostname(host) 181struct host_info *host; 182{ |
| 183#ifdef INET6 184 struct sockaddr *sin = host->sin; 185 char addr[128]; 186#ifdef USE_GETIPNODEBY 187 int h_error; 188#else 189 u_long res_options; 190#endif 191 struct hostent *hp = NULL; 192 char *ap; 193 int alen; 194#else |
|
| 139 struct sockaddr_in *sin = host->sin; 140 struct hostent *hp; | 195 struct sockaddr_in *sin = host->sin; 196 struct hostent *hp; |
| 197#endif |
|
| 141 int i; 142 143 /* 144 * On some systems, for example Solaris 2.3, gethostbyaddr(0.0.0.0) does 145 * not fail. Instead it returns "INADDR_ANY". Unfortunately, this does 146 * not work the other way around: gethostbyname("INADDR_ANY") fails. We 147 * have to special-case 0.0.0.0, in order to avoid false alerts from the 148 * host name/address checking code below. 149 */ | 198 int i; 199 200 /* 201 * On some systems, for example Solaris 2.3, gethostbyaddr(0.0.0.0) does 202 * not fail. Instead it returns "INADDR_ANY". Unfortunately, this does 203 * not work the other way around: gethostbyname("INADDR_ANY") fails. We 204 * have to special-case 0.0.0.0, in order to avoid false alerts from the 205 * host name/address checking code below. 206 */ |
| 207#ifdef INET6 208 if (sin != NULL) { 209 switch (sin->sa_family) { 210 case AF_INET: 211 if (((struct sockaddr_in *)sin)->sin_addr.s_addr == 0) { 212 strcpy(host->name, paranoid); /* name is bad, clobber it */ 213 return; 214 } 215 ap = (char *) &((struct sockaddr_in *)sin)->sin_addr; 216 alen = sizeof(struct in_addr); 217 break; 218 case AF_INET6: 219 ap = (char *) &((struct sockaddr_in6 *)sin)->sin6_addr; 220 alen = sizeof(struct in6_addr); 221 break; 222 defalut: 223 strcpy(host->name, paranoid); /* name is bad, clobber it */ 224 return; 225 } 226#ifdef USE_GETIPNODEBY 227 hp = getipnodebyaddr(ap, alen, sin->sa_family, &h_error); 228#else 229 hp = gethostbyaddr(ap, alen, sin->sa_family); 230#endif 231 } 232 if (hp) { 233#else |
|
| 150 if (sin != 0 && sin->sin_addr.s_addr != 0 151 && (hp = gethostbyaddr((char *) &(sin->sin_addr), 152 sizeof(sin->sin_addr), AF_INET)) != 0) { | 234 if (sin != 0 && sin->sin_addr.s_addr != 0 235 && (hp = gethostbyaddr((char *) &(sin->sin_addr), 236 sizeof(sin->sin_addr), AF_INET)) != 0) { |
| 237#endif |
|
| 153 154 STRN_CPY(host->name, hp->h_name, sizeof(host->name)); | 238 239 STRN_CPY(host->name, hp->h_name, sizeof(host->name)); |
| 240#if defined(INET6) && defined(USE_GETIPNODEBY) 241 freehostent(hp); 242#endif |
|
| 155 156 /* 157 * Verify that the address is a member of the address list returned 158 * by gethostbyname(hostname). 159 * 160 * Verify also that gethostbyaddr() and gethostbyname() return the same 161 * hostname, or rshd and rlogind may still end up being spoofed. 162 * 163 * On some sites, gethostbyname("localhost") returns "localhost.domain". 164 * This is a DNS artefact. We treat it as a special case. When we 165 * can't believe the address list from gethostbyname("localhost") 166 * we're in big trouble anyway. 167 */ 168 | 243 244 /* 245 * Verify that the address is a member of the address list returned 246 * by gethostbyname(hostname). 247 * 248 * Verify also that gethostbyaddr() and gethostbyname() return the same 249 * hostname, or rshd and rlogind may still end up being spoofed. 250 * 251 * On some sites, gethostbyname("localhost") returns "localhost.domain". 252 * This is a DNS artefact. We treat it as a special case. When we 253 * can't believe the address list from gethostbyname("localhost") 254 * we're in big trouble anyway. 255 */ 256 |
| 257#ifdef INET6 258#ifdef USE_GETIPNODEBY 259 hp = getipnodebyname(host->name, sin->sa_family, 260 AI_V4MAPPED | AI_ADDRCONFIG | AI_ALL, &h_error); 261#else 262 if ((_res.options & RES_INIT) == 0) { 263 if (res_init() < 0) { 264 inet_ntop(sin->sa_family, ap, addr, sizeof(addr)); 265 tcpd_warn("can't verify hostname: res_init() for %s failed", 266 addr); 267 strcpy(host->name, paranoid); /* name is bad, clobber it */ 268 return; 269 } 270 } 271 res_options = _res.options; 272 if (sin->sa_family == AF_INET6) 273 _res.options |= RES_USE_INET6; 274 else 275 _res.options &= ~RES_USE_INET6; 276 hp = gethostbyname2(host->name, 277 (sin->sa_family == AF_INET6 && 278 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)sin)->sin6_addr)) ? 279 AF_INET : sin->sa_family); 280 _res.options = res_options; 281#endif 282 if (!hp) { 283#else |
|
| 169 if ((hp = gethostbyname(host->name)) == 0) { | 284 if ((hp = gethostbyname(host->name)) == 0) { |
| 285#endif |
|
| 170 171 /* 172 * Unable to verify that the host name matches the address. This 173 * may be a transient problem or a botched name server setup. 174 */ 175 | 286 287 /* 288 * Unable to verify that the host name matches the address. This 289 * may be a transient problem or a botched name server setup. 290 */ 291 |
| 292#ifdef INET6 293#ifdef USE_GETIPNODEBY 294 tcpd_warn("can't verify hostname: getipnodebyname(%s, %s) failed", 295#else 296 tcpd_warn("can't verify hostname: gethostbyname2(%s, %s) failed", 297#endif 298 host->name, 299 (sin->sa_family == AF_INET) ? "AF_INET" : "AF_INET6"); 300#else |
|
| 176 tcpd_warn("can't verify hostname: gethostbyname(%s) failed", 177 host->name); | 301 tcpd_warn("can't verify hostname: gethostbyname(%s) failed", 302 host->name); |
| 303#endif |
|
| 178 179 } else if (STR_NE(host->name, hp->h_name) 180 && STR_NE(host->name, "localhost")) { 181 182 /* 183 * The gethostbyaddr() and gethostbyname() calls did not return 184 * the same hostname. This could be a nameserver configuration 185 * problem. It could also be that someone is trying to spoof us. --- 7 unchanged lines hidden (view full) --- 193 /* 194 * The address should be a member of the address list returned by 195 * gethostbyname(). We should first verify that the h_addrtype 196 * field is AF_INET, but this program has already caused too much 197 * grief on systems with broken library code. 198 */ 199 200 for (i = 0; hp->h_addr_list[i]; i++) { | 304 305 } else if (STR_NE(host->name, hp->h_name) 306 && STR_NE(host->name, "localhost")) { 307 308 /* 309 * The gethostbyaddr() and gethostbyname() calls did not return 310 * the same hostname. This could be a nameserver configuration 311 * problem. It could also be that someone is trying to spoof us. --- 7 unchanged lines hidden (view full) --- 319 /* 320 * The address should be a member of the address list returned by 321 * gethostbyname(). We should first verify that the h_addrtype 322 * field is AF_INET, but this program has already caused too much 323 * grief on systems with broken library code. 324 */ 325 326 for (i = 0; hp->h_addr_list[i]; i++) { |
| 327#ifdef INET6 328 if (memcmp(hp->h_addr_list[i], ap, alen) == 0) { 329#ifdef USE_GETIPNODEBY 330 freehostent(hp); 331#endif 332 return; /* name is good, keep it */ 333 } 334#else |
|
| 201 if (memcmp(hp->h_addr_list[i], 202 (char *) &sin->sin_addr, 203 sizeof(sin->sin_addr)) == 0) 204 return; /* name is good, keep it */ | 335 if (memcmp(hp->h_addr_list[i], 336 (char *) &sin->sin_addr, 337 sizeof(sin->sin_addr)) == 0) 338 return; /* name is good, keep it */ |
| 339#endif |
|
| 205 } 206 207 /* 208 * The host name does not map to the initial address. Perhaps 209 * someone has messed up. Perhaps someone compromised a name 210 * server. 211 */ 212 | 340 } 341 342 /* 343 * The host name does not map to the initial address. Perhaps 344 * someone has messed up. Perhaps someone compromised a name 345 * server. 346 */ 347 |
| 348#ifdef INET6 349 inet_ntop(sin->sa_family, ap, addr, sizeof(addr)); |
|
| 213 tcpd_warn("host name/address mismatch: %s != %.*s", | 350 tcpd_warn("host name/address mismatch: %s != %.*s", |
| 351 addr, STRING_LENGTH, hp->h_name); 352#else 353 tcpd_warn("host name/address mismatch: %s != %.*s", |
|
| 214 inet_ntoa(sin->sin_addr), STRING_LENGTH, hp->h_name); | 354 inet_ntoa(sin->sin_addr), STRING_LENGTH, hp->h_name); |
| 355#endif |
|
| 215 } 216 strcpy(host->name, paranoid); /* name is bad, clobber it */ | 356 } 357 strcpy(host->name, paranoid); /* name is bad, clobber it */ |
| 358#if defined(INET6) && defined(USE_GETIPNODEBY) 359 if (hp) 360 freehostent(hp); 361#endif |
|
| 217 } 218} 219 220/* sock_sink - absorb unreceived IP datagram */ 221 222static void sock_sink(fd) 223int fd; 224{ 225 char buf[BUFSIZ]; | 362 } 363} 364 365/* sock_sink - absorb unreceived IP datagram */ 366 367static void sock_sink(fd) 368int fd; 369{ 370 char buf[BUFSIZ]; |
| 371#ifdef INET6 372 struct sockaddr_storage sin; 373#else |
|
| 226 struct sockaddr_in sin; | 374 struct sockaddr_in sin; |
| 375#endif |
|
| 227 int size = sizeof(sin); 228 229 /* 230 * Eat up the not-yet received datagram. Some systems insist on a 231 * non-zero source address argument in the recvfrom() call below. 232 */ 233 234 (void) recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *) & sin, &size); 235} | 376 int size = sizeof(sin); 377 378 /* 379 * Eat up the not-yet received datagram. Some systems insist on a 380 * non-zero source address argument in the recvfrom() call below. 381 */ 382 383 (void) recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr *) & sin, &size); 384} |