Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 1 | /* $OpenBSD: canohost.c,v 1.67 2013/05/17 00:13:13 djm 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> |
Darren Tucker | daaa450 | 2010-01-13 22:43:33 +1100 | [diff] [blame] | 30 | #include <unistd.h> |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 31 | |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 32 | #include "xmalloc.h" |
Damien Miller | d783435 | 2006-08-05 12:39:39 +1000 | [diff] [blame] | 33 | #include "packet.h" |
Ben Lindstrom | 226cfa0 | 2001-01-22 05:34:40 +0000 | [diff] [blame] | 34 | #include "log.h" |
Ben Lindstrom | 31ca54a | 2001-02-09 02:11:24 +0000 | [diff] [blame] | 35 | #include "canohost.h" |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 36 | #include "misc.h" |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 37 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 38 | static void check_ip_options(int, char *); |
Darren Tucker | 39c7632 | 2009-06-21 18:13:57 +1000 | [diff] [blame] | 39 | static char *canonical_host_ip = NULL; |
| 40 | static int cached_port = -1; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 41 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 42 | /* |
| 43 | * Return the canonical name of the host at the other end of the socket. The |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 44 | * caller should free the returned string. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 45 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 46 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 47 | static char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 48 | get_remote_hostname(int sock, int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 49 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 50 | struct sockaddr_storage from; |
| 51 | int i; |
| 52 | socklen_t fromlen; |
| 53 | struct addrinfo hints, *ai, *aitop; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 54 | char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 55 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 56 | /* Get IP address of client. */ |
| 57 | fromlen = sizeof(from); |
| 58 | memset(&from, 0, sizeof(from)); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 59 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 60 | debug("getpeername failed: %.100s", strerror(errno)); |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 61 | cleanup_exit(255); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 62 | } |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 63 | |
Damien Miller | 2eaf37d | 2006-04-18 15:13:16 +1000 | [diff] [blame] | 64 | if (from.ss_family == AF_INET) |
| 65 | check_ip_options(sock, ntop); |
| 66 | |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 67 | ipv64_normalise_mapped(&from, &fromlen); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 68 | |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 69 | if (from.ss_family == AF_INET6) |
| 70 | fromlen = sizeof(struct sockaddr_in6); |
Damien Miller | 7bcb089 | 2000-03-11 20:45:40 +1100 | [diff] [blame] | 71 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 72 | if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 73 | NULL, 0, NI_NUMERICHOST) != 0) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 74 | fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 75 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 76 | if (!use_dns) |
| 77 | return xstrdup(ntop); |
| 78 | |
Ben Lindstrom | 121c785 | 2001-04-18 15:32:44 +0000 | [diff] [blame] | 79 | debug3("Trying to reverse map address %.100s.", ntop); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 80 | /* Map the IP address to a host name. */ |
| 81 | if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), |
Damien Miller | 9f0f5c6 | 2001-12-21 14:45:46 +1100 | [diff] [blame] | 82 | NULL, 0, NI_NAMEREQD) != 0) { |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 83 | /* Host name not found. Use ip address. */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 84 | return xstrdup(ntop); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 85 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 86 | |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 87 | /* |
| 88 | * if reverse lookup result looks like a numeric hostname, |
| 89 | * someone is trying to trick us by PTR record like following: |
| 90 | * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5 |
| 91 | */ |
| 92 | memset(&hints, 0, sizeof(hints)); |
| 93 | hints.ai_socktype = SOCK_DGRAM; /*dummy*/ |
Darren Tucker | 0f68486 | 2003-06-05 09:52:42 +1000 | [diff] [blame] | 94 | hints.ai_flags = AI_NUMERICHOST; |
Darren Tucker | 30ac73b | 2008-06-13 04:46:45 +1000 | [diff] [blame] | 95 | if (getaddrinfo(name, NULL, &hints, &ai) == 0) { |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 96 | logit("Nasty PTR record \"%s\" is set up for %s, ignoring", |
| 97 | name, ntop); |
| 98 | freeaddrinfo(ai); |
| 99 | return xstrdup(ntop); |
| 100 | } |
| 101 | |
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 | * Convert it to all lowercase (which is expected by the rest |
| 104 | * of this software). |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 105 | */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 106 | for (i = 0; name[i]; i++) |
| 107 | if (isupper(name[i])) |
Damien Miller | 1d2b670 | 2006-03-26 14:09:54 +1100 | [diff] [blame] | 108 | name[i] = (char)tolower(name[i]); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 109 | /* |
| 110 | * Map it back to an IP address and check that the given |
| 111 | * address actually is an address of this host. This is |
| 112 | * necessary because anyone with access to a name server can |
| 113 | * define arbitrary names for an IP address. Mapping from |
| 114 | * name to IP address can be trusted better (but can still be |
| 115 | * fooled if the intruder has access to the name server of |
| 116 | * the domain). |
| 117 | */ |
| 118 | memset(&hints, 0, sizeof(hints)); |
| 119 | hints.ai_family = from.ss_family; |
| 120 | hints.ai_socktype = SOCK_STREAM; |
| 121 | if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 122 | logit("reverse mapping checking getaddrinfo for %.700s " |
Damien Miller | de85a28 | 2006-03-15 12:06:41 +1100 | [diff] [blame] | 123 | "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop); |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 124 | return xstrdup(ntop); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 125 | } |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 126 | /* Look for the address from the list of addresses. */ |
| 127 | for (ai = aitop; ai; ai = ai->ai_next) { |
| 128 | if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, |
| 129 | sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && |
| 130 | (strcmp(ntop, ntop2) == 0)) |
| 131 | break; |
| 132 | } |
| 133 | freeaddrinfo(aitop); |
| 134 | /* If we reached the end of the list, the address was not there. */ |
| 135 | if (!ai) { |
| 136 | /* Address not found for the host name. */ |
Damien Miller | 996acd2 | 2003-04-09 20:59:48 +1000 | [diff] [blame] | 137 | logit("Address %.100s maps to %.600s, but this does not " |
Damien Miller | 5eb137c | 2005-12-31 16:19:53 +1100 | [diff] [blame] | 138 | "map back to the address - POSSIBLE BREAK-IN ATTEMPT!", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 139 | ntop, name); |
| 140 | return xstrdup(ntop); |
| 141 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 142 | return xstrdup(name); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 143 | } |
| 144 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 145 | /* |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 146 | * If IP options are supported, make sure there are none (log and |
| 147 | * disconnect them if any are found). Basically we are worried about |
| 148 | * source routing; it can be used to pretend you are somebody |
| 149 | * (ip-address) you are not. That itself may be "almost acceptable" |
| 150 | * under certain circumstances, but rhosts autentication is useless |
| 151 | * if source routing is accepted. Notice also that if we just dropped |
| 152 | * source routing here, the other side could use IP spoofing to do |
| 153 | * rest of the interaction and could still bypass security. So we |
| 154 | * exit here if we detect any IP options. |
| 155 | */ |
| 156 | /* IPv4 only */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 157 | static void |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 158 | check_ip_options(int sock, char *ipaddr) |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 159 | { |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 160 | #ifdef IP_OPTIONS |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 161 | u_char options[200]; |
| 162 | char text[sizeof(options) * 3 + 1]; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 163 | socklen_t option_size; |
Damien Miller | eccb9de | 2005-06-17 12:59:34 +1000 | [diff] [blame] | 164 | u_int i; |
| 165 | int ipproto; |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 166 | struct protoent *ip; |
| 167 | |
| 168 | if ((ip = getprotobyname("ip")) != NULL) |
| 169 | ipproto = ip->p_proto; |
| 170 | else |
| 171 | ipproto = IPPROTO_IP; |
| 172 | option_size = sizeof(options); |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 173 | if (getsockopt(sock, ipproto, IP_OPTIONS, options, |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 174 | &option_size) >= 0 && option_size != 0) { |
Ben Lindstrom | 075390a | 2001-02-10 21:34:46 +0000 | [diff] [blame] | 175 | text[0] = '\0'; |
| 176 | for (i = 0; i < option_size; i++) |
| 177 | snprintf(text + i*3, sizeof(text) - i*3, |
| 178 | " %2.2x", options[i]); |
Damien Miller | 4d3fd54 | 2005-11-05 15:13:24 +1100 | [diff] [blame] | 179 | fatal("Connection from %.100s with IP options:%.800s", |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 180 | ipaddr, text); |
| 181 | } |
Darren Tucker | 89f4cf0 | 2003-08-07 13:29:04 +1000 | [diff] [blame] | 182 | #endif /* IP_OPTIONS */ |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 183 | } |
| 184 | |
Darren Tucker | 2fba993 | 2005-02-02 23:30:24 +1100 | [diff] [blame] | 185 | void |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 186 | ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len) |
| 187 | { |
| 188 | struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr; |
| 189 | struct sockaddr_in *a4 = (struct sockaddr_in *)addr; |
| 190 | struct in_addr inaddr; |
| 191 | u_int16_t port; |
| 192 | |
Damien Miller | 94cf4c8 | 2005-07-17 17:04:47 +1000 | [diff] [blame] | 193 | if (addr->ss_family != AF_INET6 || |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 194 | !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) |
| 195 | return; |
| 196 | |
| 197 | debug3("Normalising mapped IPv4 in IPv6 address"); |
| 198 | |
| 199 | memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr)); |
| 200 | port = a6->sin6_port; |
| 201 | |
Damien Miller | 47e57bf | 2010-10-12 13:28:12 +1100 | [diff] [blame] | 202 | bzero(a4, sizeof(*a4)); |
Damien Miller | 927f527 | 2003-11-24 12:57:25 +1100 | [diff] [blame] | 203 | |
| 204 | a4->sin_family = AF_INET; |
| 205 | *len = sizeof(*a4); |
| 206 | memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr)); |
| 207 | a4->sin_port = port; |
| 208 | } |
| 209 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 210 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 211 | * Return the canonical name of the host in the other side of the current |
| 212 | * connection. The host name is cached, so it is efficient to call this |
| 213 | * several times. |
| 214 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 215 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 216 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 217 | get_canonical_hostname(int use_dns) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 218 | { |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 219 | char *host; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 220 | static char *canonical_host_name = NULL; |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 221 | static char *remote_ip = NULL; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 222 | |
Damien Miller | 3380426 | 2001-02-04 23:20:18 +1100 | [diff] [blame] | 223 | /* Check if we have previously retrieved name with same option. */ |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 224 | if (use_dns && canonical_host_name != NULL) |
| 225 | return canonical_host_name; |
| 226 | if (!use_dns && remote_ip != NULL) |
| 227 | return remote_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 228 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 229 | /* Get the real hostname if socket; otherwise return UNKNOWN. */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 230 | if (packet_connection_is_on_socket()) |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 231 | host = get_remote_hostname(packet_get_connection_in(), use_dns); |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 232 | else |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 233 | host = "UNKNOWN"; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 234 | |
Damien Miller | 24ecf61 | 2005-11-05 15:16:52 +1100 | [diff] [blame] | 235 | if (use_dns) |
| 236 | canonical_host_name = host; |
| 237 | else |
| 238 | remote_ip = host; |
| 239 | return host; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 240 | } |
| 241 | |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 242 | /* |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 243 | * Returns the local/remote IP-address/hostname of socket as a string. |
| 244 | * The returned string must be freed. |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 245 | */ |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 246 | static char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 247 | get_socket_address(int sock, int remote, int flags) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 248 | { |
| 249 | struct sockaddr_storage addr; |
| 250 | socklen_t addrlen; |
| 251 | char ntop[NI_MAXHOST]; |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 252 | int r; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 253 | |
| 254 | /* Get IP address of client. */ |
| 255 | addrlen = sizeof(addr); |
| 256 | memset(&addr, 0, sizeof(addr)); |
| 257 | |
| 258 | if (remote) { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 259 | if (getpeername(sock, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 260 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 261 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 262 | } else { |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 263 | if (getsockname(sock, (struct sockaddr *)&addr, &addrlen) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 264 | < 0) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 265 | return NULL; |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 266 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 267 | |
| 268 | /* Work around Linux IPv6 weirdness */ |
| 269 | if (addr.ss_family == AF_INET6) |
| 270 | addrlen = sizeof(struct sockaddr_in6); |
| 271 | |
Darren Tucker | 5b115d4 | 2005-05-03 19:05:32 +1000 | [diff] [blame] | 272 | ipv64_normalise_mapped(&addr, &addrlen); |
| 273 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 274 | /* Get the address in ascii. */ |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 275 | if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop, |
| 276 | sizeof(ntop), NULL, 0, flags)) != 0) { |
| 277 | error("get_socket_address: getnameinfo %d failed: %s", flags, |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 278 | ssh_gai_strerror(r)); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 279 | return NULL; |
| 280 | } |
| 281 | return xstrdup(ntop); |
| 282 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 283 | |
| 284 | char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 285 | get_peer_ipaddr(int sock) |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 286 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 287 | char *p; |
| 288 | |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 289 | if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 290 | return p; |
| 291 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 292 | } |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 293 | |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 294 | char * |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 295 | get_local_ipaddr(int sock) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 296 | { |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 297 | char *p; |
| 298 | |
Darren Tucker | 3f9fdc7 | 2004-06-22 12:56:01 +1000 | [diff] [blame] | 299 | if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL) |
Damien Miller | b2f844d | 2002-09-25 12:19:08 +1000 | [diff] [blame] | 300 | return p; |
| 301 | return xstrdup("UNKNOWN"); |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | char * |
Darren Tucker | daaa450 | 2010-01-13 22:43:33 +1100 | [diff] [blame] | 305 | get_local_name(int fd) |
Ben Lindstrom | 5eabda3 | 2001-04-12 23:34:34 +0000 | [diff] [blame] | 306 | { |
Darren Tucker | daaa450 | 2010-01-13 22:43:33 +1100 | [diff] [blame] | 307 | char *host, myname[NI_MAXHOST]; |
| 308 | |
| 309 | /* Assume we were passed a socket */ |
| 310 | if ((host = get_socket_address(fd, 0, NI_NAMEREQD)) != NULL) |
| 311 | return host; |
| 312 | |
| 313 | /* Handle the case where we were passed a pipe */ |
| 314 | if (gethostname(myname, sizeof(myname)) == -1) { |
| 315 | verbose("get_local_name: gethostname: %s", strerror(errno)); |
| 316 | } else { |
| 317 | host = xstrdup(myname); |
| 318 | } |
| 319 | |
| 320 | return host; |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 321 | } |
| 322 | |
Darren Tucker | 39c7632 | 2009-06-21 18:13:57 +1000 | [diff] [blame] | 323 | void |
| 324 | clear_cached_addr(void) |
| 325 | { |
Darren Tucker | a627d42 | 2013-06-02 07:31:17 +1000 | [diff] [blame] | 326 | free(canonical_host_ip); |
| 327 | canonical_host_ip = NULL; |
Darren Tucker | 39c7632 | 2009-06-21 18:13:57 +1000 | [diff] [blame] | 328 | cached_port = -1; |
| 329 | } |
| 330 | |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 331 | /* |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 332 | * 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] | 333 | * string must not be freed. |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 334 | */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 335 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 336 | const char * |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 337 | get_remote_ipaddr(void) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 338 | { |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 339 | /* Check whether we have cached the ipaddr. */ |
| 340 | if (canonical_host_ip == NULL) { |
| 341 | if (packet_connection_is_on_socket()) { |
| 342 | canonical_host_ip = |
| 343 | get_peer_ipaddr(packet_get_connection_in()); |
| 344 | if (canonical_host_ip == NULL) |
Darren Tucker | 3e33cec | 2003-10-02 16:12:36 +1000 | [diff] [blame] | 345 | cleanup_exit(255); |
Damien Miller | d83ff35 | 2001-01-30 09:19:34 +1100 | [diff] [blame] | 346 | } else { |
| 347 | /* If not on socket, return UNKNOWN. */ |
| 348 | canonical_host_ip = xstrdup("UNKNOWN"); |
| 349 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 350 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 351 | return canonical_host_ip; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 352 | } |
| 353 | |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 354 | const char * |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 355 | get_remote_name_or_ip(u_int utmp_len, int use_dns) |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 356 | { |
| 357 | static const char *remote = ""; |
| 358 | if (utmp_len > 0) |
Damien Miller | 3a961dc | 2003-06-03 10:25:48 +1000 | [diff] [blame] | 359 | remote = get_canonical_hostname(use_dns); |
Ben Lindstrom | f15a386 | 2001-04-05 23:32:17 +0000 | [diff] [blame] | 360 | if (utmp_len == 0 || strlen(remote) > utmp_len) |
| 361 | remote = get_remote_ipaddr(); |
| 362 | return remote; |
| 363 | } |
| 364 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 365 | /* Returns the local/remote port for the socket. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 366 | |
Damien Miller | 4bf648f | 2009-02-14 16:28:21 +1100 | [diff] [blame] | 367 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 368 | get_sock_port(int sock, int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 369 | { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 370 | struct sockaddr_storage from; |
| 371 | socklen_t fromlen; |
| 372 | char strport[NI_MAXSERV]; |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 373 | int r; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 374 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 375 | /* Get IP address of client. */ |
| 376 | fromlen = sizeof(from); |
| 377 | memset(&from, 0, sizeof(from)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 378 | if (local) { |
| 379 | if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
| 380 | error("getsockname failed: %.100s", strerror(errno)); |
| 381 | return 0; |
| 382 | } |
| 383 | } else { |
Ben Lindstrom | acaac97 | 2002-12-23 02:13:37 +0000 | [diff] [blame] | 384 | if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) { |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 385 | debug("getpeername failed: %.100s", strerror(errno)); |
Damien Miller | 677257f | 2005-06-17 12:55:03 +1000 | [diff] [blame] | 386 | return -1; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 387 | } |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 388 | } |
Damien Miller | 5e4471e | 2003-01-07 10:51:23 +1100 | [diff] [blame] | 389 | |
| 390 | /* Work around Linux IPv6 weirdness */ |
| 391 | if (from.ss_family == AF_INET6) |
| 392 | fromlen = sizeof(struct sockaddr_in6); |
| 393 | |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 394 | /* Return port number. */ |
Damien Miller | 9b8073e | 2005-03-01 21:16:18 +1100 | [diff] [blame] | 395 | if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, |
| 396 | strport, sizeof(strport), NI_NUMERICSERV)) != 0) |
| 397 | fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s", |
Darren Tucker | 4abde77 | 2007-12-29 02:43:51 +1100 | [diff] [blame] | 398 | ssh_gai_strerror(r)); |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 399 | return atoi(strport); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 400 | } |
| 401 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 402 | /* Returns remote/local port number for the current connection. */ |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 403 | |
Ben Lindstrom | bba8121 | 2001-06-25 05:01:22 +0000 | [diff] [blame] | 404 | static int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 405 | get_port(int local) |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 406 | { |
Damien Miller | 5428f64 | 1999-11-25 11:54:57 +1100 | [diff] [blame] | 407 | /* |
| 408 | * If the connection is not a socket, return 65535. This is |
| 409 | * intentionally chosen to be an unprivileged port number. |
| 410 | */ |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 411 | if (!packet_connection_is_on_socket()) |
Damien Miller | 95def09 | 1999-11-25 00:26:21 +1100 | [diff] [blame] | 412 | return 65535; |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 413 | |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 414 | /* Get socket and return the port number. */ |
| 415 | return get_sock_port(packet_get_connection_in(), local); |
| 416 | } |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 417 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 418 | int |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 419 | get_peer_port(int sock) |
| 420 | { |
| 421 | return get_sock_port(sock, 0); |
| 422 | } |
| 423 | |
Damien Miller | 4af5130 | 2000-04-16 11:18:38 +1000 | [diff] [blame] | 424 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 425 | get_remote_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 426 | { |
Damien Miller | 0670c73 | 2004-07-21 21:53:34 +1000 | [diff] [blame] | 427 | /* Cache to avoid getpeername() on a dead connection */ |
Darren Tucker | 39c7632 | 2009-06-21 18:13:57 +1000 | [diff] [blame] | 428 | if (cached_port == -1) |
| 429 | cached_port = get_port(0); |
Damien Miller | 0670c73 | 2004-07-21 21:53:34 +1000 | [diff] [blame] | 430 | |
Darren Tucker | 39c7632 | 2009-06-21 18:13:57 +1000 | [diff] [blame] | 431 | return cached_port; |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | int |
Ben Lindstrom | 3c36bb2 | 2001-12-06 17:55:26 +0000 | [diff] [blame] | 435 | get_local_port(void) |
Damien Miller | 34132e5 | 2000-01-14 15:45:46 +1100 | [diff] [blame] | 436 | { |
| 437 | return get_port(1); |
Damien Miller | d4a8b7e | 1999-10-27 13:42:43 +1000 | [diff] [blame] | 438 | } |