Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame^] | 1 | /* $OpenBSD: canohost.c,v 1.62 2007/12/27 14:22:08 dtucker Exp $ */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 2 | /* |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 3 | * Author: Tatu Ylonen <ylo@cs.hut.fi> |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 4 | * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
| 5 | * All rights reserved |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 6 | * Functions for returning the canonical host name of the remote site. |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 7 | * |
Damien Miller | e4340be | 2000-09-16 13:29:08 +1100 | [diff] [blame] | 8 | * As far as I am concerned, the code I have written for this software |
| 9 | * can be used freely for any purpose. Any derived versions of this |
| 10 | * software must be clearly marked as such, and if the derived work is |
| 11 | * incompatible with the protocol description in the RFC file, it must be |
| 12 | * called by a name other than "ssh" or "Secure Shell". |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 13 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 14 | |
| 15 | #include "includes.h" |
Damien Miller | c7b0636 | 2006-03-15 11:53:45 +1100 | [diff] [blame] | 16 | |
Damien Miller | e3b60b5 | 2006-07-10 21:08:03 +1000 | [diff] [blame] | 17 | #include <sys/types.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 18 | #include <sys/socket.h> |
| 19 | |
| 20 | #include <netinet/in.h> |
Darren Tucker | dace233 | 2006-09-22 19:22:17 +1000 | [diff] [blame] | 21 | #include <arpa/inet.h> |
Damien Miller | 8ec8c3e | 2006-07-10 20:35:38 +1000 | [diff] [blame] | 22 | |
Damien Miller | c7b0636 | 2006-03-15 11:53:45 +1100 | [diff] [blame] | 23 | #include <ctype.h> |
Darren Tucker | 3997249 | 2006-07-12 22:22:46 +1000 | [diff] [blame] | 24 | #include <errno.h> |
Damien Miller | b8fe89c | 2006-07-24 14:51:00 +1000 | [diff] [blame] | 25 | #include <netdb.h> |
Damien Miller | a7a73ee | 2006-08-05 11:37:59 +1000 | [diff] [blame] | 26 | #include <stdio.h> |
Damien Miller | e7a1e5c | 2006-08-05 11:34:19 +1000 | [diff] [blame] | 27 | #include <stdlib.h> |
Damien Miller | e3476ed | 2006-07-24 14:13:33 +1000 | [diff] [blame] | 28 | #include <string.h> |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 29 | #include <stdarg.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 30 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 31 | #include "xmalloc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 32 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 33 | #include "log.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 34 | #include "canohost.h" |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame^] | 35 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 36 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 37 | static void check_ip_options(int, char *); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 38 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 39 | /* |
| 40 | * Return the canonical name of the host at the other end of the socket. The |
| 41 | * caller should free the returned string with xfree. |
| 42 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 43 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 44 | static char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 45 | get_remote_hostname(int sock, int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 47 | struct sockaddr_storage from; |
| 48 | int i; |
| 49 | socklen_t fromlen; |
| 50 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 51 | char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 52 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 53 | /* Get IP address of client. */ |
| 54 | fromlen = sizeof(from); |
| 55 | memset(&from, 0, sizeof(from)); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 56 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 57 | debug("getpeername failed: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 58 | cleanup_exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 59 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 60 | |
Damien Miller | 2eaf37d | 2006-04-18 15:13:16 +1000 | [diff] [blame] | 61 | if (from.ss_family == AF_INET) |
| 62 | check_ip_options(sock, ntop); |
| 63 | |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 64 | ipv64_normalise_mapped(&from, &fromlen); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 65 | |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 66 | if (from.ss_family == AF_INET6) |
| 67 | fromlen = sizeof(struct sockaddr_in6); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 68 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 69 | if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 70 | NULL, 0, NI_NUMERICHOST) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 71 | fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 72 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 73 | if (!use_dns) |
| 74 | return xstrdup(ntop); |
| 75 | |
Ben Lindstrom | 121c785 | 2001-04-18 15:32:44 +0000 | [diff] [blame] | 76 | debug3("Trying to reverse map address %.100s.", ntop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 77 | /* Map the IP address to a host name. */ |
| 78 | if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 79 | NULL, 0, NI_NAMEREQD) != 0) { |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 80 | /* Host name not found. Use ip address. */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 81 | return xstrdup(ntop); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 82 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 83 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 84 | /* |
| 85 | * if reverse lookup result looks like a numeric hostname, |
| 86 | * someone is trying to trick us by PTR record like following: |
| 87 | * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5 |
| 88 | */ |
| 89 | memset(&hints, 0, sizeof(hints)); |
| 90 | hints.ai_socktype = SOCK_DGRAM; /*dummy*/ |
Darren Tucker | 0f68486 | 2003-06-05 09:52:42 +1000 | [diff] [blame] | 91 | hints.ai_flags = AI_NUMERICHOST; |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 92 | if (getaddrinfo(name, "0", &hints, &ai) == 0) { |
| 93 | logit("Nasty PTR record \"%s\" is set up for %s, ignoring", |
| 94 | name, ntop); |
| 95 | freeaddrinfo(ai); |
| 96 | return xstrdup(ntop); |
| 97 | } |
| 98 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 99 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 100 | * Convert it to all lowercase (which is expected by the rest |
| 101 | * of this software). |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 102 | */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 103 | for (i = 0; name[i]; i++) |
| 104 | if (isupper(name[i])) |
Damien Miller | 1d2b670 | 2006-03-26 14:09:54 +1100 | [diff] [blame] | 105 | name[i] = (char)tolower(name[i]); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 106 | /* |
| 107 | * Map it back to an IP address and check that the given |
| 108 | * address actually is an address of this host. This is |
| 109 | * necessary because anyone with access to a name server can |
| 110 | * define arbitrary names for an IP address. Mapping from |
| 111 | * name to IP address can be trusted better (but can still be |
| 112 | * fooled if the intruder has access to the name server of |
| 113 | * the domain). |
| 114 | */ |
| 115 | memset(&hints, 0, sizeof(hints)); |
| 116 | hints.ai_family = from.ss_family; |
| 117 | hints.ai_socktype = SOCK_STREAM; |
| 118 | if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 119 | logit("reverse mapping checking getaddrinfo for %.700s " |
Damien Miller | de85a28 | 2006-03-15 12:06:41 +1100 | [diff] [blame] | 120 | "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 121 | return xstrdup(ntop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 122 | } |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 123 | /* Look for the address from the list of addresses. */ |
| 124 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 125 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, |
| 126 | sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && |
| 127 | (strcmp(ntop, ntop2) == 0)) |
| 128 | break; |
| 129 | } |
| 130 | freeaddrinfo(aitop); |
| 131 | /* If we reached the end of the list, the address was not there. */ |
| 132 | if (!ai) { |
| 133 | /* Address not found for the host name. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 134 | logit("Address %.100s maps to %.600s, but this does not " |
Damien Miller | 5eb137c | 2005-12-31 16:19:53 +1100 | [diff] [blame] | 135 | "map back to the address - POSSIBLE BREAK-IN ATTEMPT!", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 136 | ntop, name); |
| 137 | return xstrdup(ntop); |
| 138 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 139 | return xstrdup(name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 140 | } |
| 141 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 142 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 143 | * If IP options are supported, make sure there are none (log and |
| 144 | * disconnect them if any are found). Basically we are worried about |
| 145 | * source routing; it can be used to pretend you are somebody |
| 146 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 147 | * under certain circumstances, but rhosts autentication is useless |
| 148 | * if source routing is accepted. Notice also that if we just dropped |
| 149 | * source routing here, the other side could use IP spoofing to do |
| 150 | * rest of the interaction and could still bypass security. So we |
| 151 | * exit here if we detect any IP options. |
| 152 | */ |
| 153 | /* IPv4 only */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 154 | static void |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 155 | check_ip_options(int sock, char *ipaddr) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 156 | { |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 157 | #ifdef IP_OPTIONS |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 158 | u_char options[200]; |
| 159 | char text[sizeof(options) * 3 + 1]; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 160 | socklen_t option_size; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 161 | u_int i; |
| 162 | int ipproto; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 163 | struct protoent *ip; |
| 164 | |
| 165 | if ((ip = getprotobyname("ip")) != NULL) |
| 166 | ipproto = ip->p_proto; |
| 167 | else |
| 168 | ipproto = IPPROTO_IP; |
| 169 | option_size = sizeof(options); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 170 | if (getsockopt(sock, ipproto, IP_OPTIONS, options, |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 171 | &option_size) >= 0 && option_size != 0) { |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 172 | text[0] = '\0'; |
| 173 | for (i = 0; i < option_size; i++) |
| 174 | snprintf(text + i*3, sizeof(text) - i*3, |
| 175 | " %2.2x", options[i]); |
Damien Miller | 4d3fd54 | 2005-11-05 15:13:24 +1100 | [diff] [blame] | 176 | fatal("Connection from %.100s with IP options:%.800s", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 177 | ipaddr, text); |
| 178 | } |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 179 | #endif /* IP_OPTIONS */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 180 | } |
| 181 | |
Darren Tucker | 2fba993 | 2005-02-02 23:30:24 +1100 | [diff] [blame] | 182 | void |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 183 | ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len) |
| 184 | { |
| 185 | struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr; |
| 186 | struct sockaddr_in *a4 = (struct sockaddr_in *)addr; |
| 187 | struct in_addr inaddr; |
| 188 | u_int16_t port; |
| 189 | |
Damien Miller | 94cf4c8 | 2005-07-17 17:04:47 +1000 | [diff] [blame] | 190 | if (addr->ss_family != AF_INET6 || |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 191 | !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) |
| 192 | return; |
| 193 | |
| 194 | debug3("Normalising mapped IPv4 in IPv6 address"); |
| 195 | |
| 196 | memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr)); |
| 197 | port = a6->sin6_port; |
| 198 | |
| 199 | memset(addr, 0, sizeof(*a4)); |
| 200 | |
| 201 | a4->sin_family = AF_INET; |
| 202 | *len = sizeof(*a4); |
| 203 | memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr)); |
| 204 | a4->sin_port = port; |
| 205 | } |
| 206 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 207 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 208 | * Return the canonical name of the host in the other side of the current |
| 209 | * connection. The host name is cached, so it is efficient to call this |
| 210 | * several times. |
| 211 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 212 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 213 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 214 | get_canonical_hostname(int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | { |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 216 | char *host; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 217 | static char *canonical_host_name = NULL; |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 218 | static char *remote_ip = NULL; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 219 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 220 | /* Check if we have previously retrieved name with same option. */ |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 221 | if (use_dns && canonical_host_name != NULL) |
| 222 | return canonical_host_name; |
| 223 | if (!use_dns && remote_ip != NULL) |
| 224 | return remote_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 225 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 226 | /* Get the real hostname if socket; otherwise return UNKNOWN. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 227 | if (packet_connection_is_on_socket()) |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 228 | host = get_remote_hostname(packet_get_connection_in(), use_dns); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | else |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 230 | host = "UNKNOWN"; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 231 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 232 | if (use_dns) |
| 233 | canonical_host_name = host; |
| 234 | else |
| 235 | remote_ip = host; |
| 236 | return host; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 237 | } |
| 238 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 239 | /* |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 240 | * Returns the local/remote IP-address/hostname of socket as a string. |
| 241 | * The returned string must be freed. |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 242 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 243 | static char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 244 | get_socket_address(int sock, int remote, int flags) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 245 | { |
| 246 | struct sockaddr_storage addr; |
| 247 | socklen_t addrlen; |
| 248 | char ntop[NI_MAXHOST]; |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 249 | int r; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 250 | |
| 251 | /* Get IP address of client. */ |
| 252 | addrlen = sizeof(addr); |
| 253 | memset(&addr, 0, sizeof(addr)); |
| 254 | |
| 255 | if (remote) { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 256 | if (getpeername(sock, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 257 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 258 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 259 | } else { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 260 | if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 261 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 262 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 263 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 264 | |
| 265 | /* Work around Linux IPv6 weirdness */ |
| 266 | if (addr.ss_family == AF_INET6) |
| 267 | addrlen = sizeof(struct sockaddr_in6); |
| 268 | |
Darren Tucker | 5b115d4 | 2005-05-03 19:05:32 +1000 | [diff] [blame] | 269 | ipv64_normalise_mapped(&addr, &addrlen); |
| 270 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 271 | /* Get the address in ascii. */ |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 272 | if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop, |
| 273 | sizeof(ntop), NULL, 0, flags)) != 0) { |
| 274 | error("get_socket_address: getnameinfo %d failed: %s", flags, |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame^] | 275 | ssh_gai_strerror(r)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 276 | return NULL; |
| 277 | } |
| 278 | return xstrdup(ntop); |
| 279 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 280 | |
| 281 | char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 282 | get_peer_ipaddr(int sock) |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 283 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 284 | char *p; |
| 285 | |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 286 | if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 287 | return p; |
| 288 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 289 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 290 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 291 | char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 292 | get_local_ipaddr(int sock) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 293 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 294 | char *p; |
| 295 | |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 296 | if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 297 | return p; |
| 298 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 299 | } |
| 300 | |
| 301 | char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 302 | get_local_name(int sock) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 303 | { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 304 | return get_socket_address(sock, 0, NI_NAMEREQD); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 308 | * Returns the IP-address of the remote host as a string. The returned |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 309 | * string must not be freed. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 310 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 311 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 312 | const char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 313 | get_remote_ipaddr(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 314 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 315 | static char *canonical_host_ip = NULL; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 316 | |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 317 | /* Check whether we have cached the ipaddr. */ |
| 318 | if (canonical_host_ip == NULL) { |
| 319 | if (packet_connection_is_on_socket()) { |
| 320 | canonical_host_ip = |
| 321 | get_peer_ipaddr(packet_get_connection_in()); |
| 322 | if (canonical_host_ip == NULL) |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 323 | cleanup_exit(255); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 324 | } else { |
| 325 | /* If not on socket, return UNKNOWN. */ |
| 326 | canonical_host_ip = xstrdup("UNKNOWN"); |
| 327 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 328 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 329 | return canonical_host_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 330 | } |
| 331 | |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 332 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 333 | get_remote_name_or_ip(u_int utmp_len, int use_dns) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 334 | { |
| 335 | static const char *remote = ""; |
| 336 | if (utmp_len > 0) |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 337 | remote = get_canonical_hostname(use_dns); |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 338 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
| 339 | remote = get_remote_ipaddr(); |
| 340 | return remote; |
| 341 | } |
| 342 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 343 | /* Returns the local/remote port for the socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 344 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 345 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 346 | get_sock_port(int sock, int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 347 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 348 | struct sockaddr_storage from; |
| 349 | socklen_t fromlen; |
| 350 | char strport[NI_MAXSERV]; |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 351 | int r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 352 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 353 | /* Get IP address of client. */ |
| 354 | fromlen = sizeof(from); |
| 355 | memset(&from, 0, sizeof(from)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 356 | if (local) { |
| 357 | if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
| 358 | error("getsockname failed: %.100s", strerror(errno)); |
| 359 | return 0; |
| 360 | } |
| 361 | } else { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 362 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 363 | debug("getpeername failed: %.100s", strerror(errno)); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 364 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 365 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 366 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 367 | |
| 368 | /* Work around Linux IPv6 weirdness */ |
| 369 | if (from.ss_family == AF_INET6) |
| 370 | fromlen = sizeof(struct sockaddr_in6); |
| 371 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 372 | /* Return port number. */ |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 373 | if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, |
| 374 | strport, sizeof(strport), NI_NUMERICSERV)) != 0) |
| 375 | fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame^] | 376 | ssh_gai_strerror(r)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 377 | return atoi(strport); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 378 | } |
| 379 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 380 | /* Returns remote/local port number for the current connection. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 381 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 382 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 383 | get_port(int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 384 | { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 385 | /* |
| 386 | * If the connection is not a socket, return 65535. This is |
| 387 | * intentionally chosen to be an unprivileged port number. |
| 388 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 389 | if (!packet_connection_is_on_socket()) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 390 | return 65535; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 391 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 392 | /* Get socket and return the port number. */ |
| 393 | return get_sock_port(packet_get_connection_in(), local); |
| 394 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 395 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 396 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 397 | get_peer_port(int sock) |
| 398 | { |
| 399 | return get_sock_port(sock, 0); |
| 400 | } |
| 401 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 402 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 403 | get_remote_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 404 | { |
Damien Miller | 0670c73 | 2004-07-21 21:53:34 +1000 | [diff] [blame] | 405 | static int port = -1; |
| 406 | |
| 407 | /* Cache to avoid getpeername() on a dead connection */ |
| 408 | if (port == -1) |
| 409 | port = get_port(0); |
| 410 | |
| 411 | return port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 412 | } |
| 413 | |
| 414 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 415 | get_local_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 416 | { |
| 417 | return get_port(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 418 | } |