diff options
Diffstat (limited to 'crypto/openssh/canohost.c')
| -rw-r--r-- | crypto/openssh/canohost.c | 274 |
1 files changed, 0 insertions, 274 deletions
diff --git a/crypto/openssh/canohost.c b/crypto/openssh/canohost.c deleted file mode 100644 index a73f8d0ecf2d4..0000000000000 --- a/crypto/openssh/canohost.c +++ /dev/null @@ -1,274 +0,0 @@ -/* - * - * canohost.c - * - * Author: Tatu Ylonen <ylo@cs.hut.fi> - * - * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland - * All rights reserved - * - * Created: Sun Jul 2 17:52:22 1995 ylo - * - * Functions for returning the canonical host name of the remote site. - * - */ - -#include "includes.h" -RCSID("$Id: canohost.c,v 1.12 2000/04/14 10:30:30 markus Exp $"); - -#include "packet.h" -#include "xmalloc.h" -#include "ssh.h" - -/* - * Return the canonical name of the host at the other end of the socket. The - * caller should free the returned string with xfree. - */ - -char * -get_remote_hostname(int socket) -{ - struct sockaddr_storage from; - int i; - socklen_t fromlen; - struct addrinfo hints, *ai, *aitop; - char name[MAXHOSTNAMELEN]; - char ntop[NI_MAXHOST], ntop2[NI_MAXHOST]; - - /* Get IP address of client. */ - fromlen = sizeof(from); - memset(&from, 0, sizeof(from)); - if (getpeername(socket, (struct sockaddr *) & from, &fromlen) < 0) { - debug("getpeername failed: %.100s", strerror(errno)); - fatal_cleanup(); - } - if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), - NULL, 0, NI_NUMERICHOST) != 0) - fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); - - /* Map the IP address to a host name. */ - if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name), - NULL, 0, NI_NAMEREQD) == 0) { - /* Got host name. */ - name[sizeof(name) - 1] = '\0'; - /* - * Convert it to all lowercase (which is expected by the rest - * of this software). - */ - for (i = 0; name[i]; i++) - if (isupper(name[i])) - name[i] = tolower(name[i]); - - /* - * Map it back to an IP address and check that the given - * address actually is an address of this host. This is - * necessary because anyone with access to a name server can - * define arbitrary names for an IP address. Mapping from - * name to IP address can be trusted better (but can still be - * fooled if the intruder has access to the name server of - * the domain). - */ - memset(&hints, 0, sizeof(hints)); - hints.ai_family = from.ss_family; - hints.ai_socktype = SOCK_STREAM; - if (getaddrinfo(name, NULL, &hints, &aitop) != 0) { - log("reverse mapping checking getaddrinfo for %.700s failed - POSSIBLE BREAKIN ATTEMPT!", name); - strlcpy(name, ntop, sizeof name); - goto check_ip_options; - } - /* Look for the address from the list of addresses. */ - for (ai = aitop; ai; ai = ai->ai_next) { - if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2, - sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 && - (strcmp(ntop, ntop2) == 0)) - break; - } - freeaddrinfo(aitop); - /* If we reached the end of the list, the address was not there. */ - if (!ai) { - /* Address not found for the host name. */ - log("Address %.100s maps to %.600s, but this does not map back to the address - POSSIBLE BREAKIN ATTEMPT!", - ntop, name); - strlcpy(name, ntop, sizeof name); - goto check_ip_options; - } - /* Address was found for the host name. We accept the host name. */ - } else { - /* Host name not found. Use ascii representation of the address. */ - strlcpy(name, ntop, sizeof name); - log("Could not reverse map address %.100s.", name); - } - -check_ip_options: - - /* - * If IP options are supported, make sure there are none (log and - * disconnect them if any are found). Basically we are worried about - * source routing; it can be used to pretend you are somebody - * (ip-address) you are not. That itself may be "almost acceptable" - * under certain circumstances, but rhosts autentication is useless - * if source routing is accepted. Notice also that if we just dropped - * source routing here, the other side could use IP spoofing to do - * rest of the interaction and could still bypass security. So we - * exit here if we detect any IP options. - */ - /* IP options -- IPv4 only */ - if (from.ss_family == AF_INET) { - unsigned char options[200], *ucp; - char text[1024], *cp; - socklen_t option_size; - int ipproto; - struct protoent *ip; - - if ((ip = getprotobyname("ip")) != NULL) - ipproto = ip->p_proto; - else - ipproto = IPPROTO_IP; - option_size = sizeof(options); - if (getsockopt(0, ipproto, IP_OPTIONS, (char *) options, - &option_size) >= 0 && option_size != 0) { - cp = text; - /* Note: "text" buffer must be at least 3x as big as options. */ - for (ucp = options; option_size > 0; ucp++, option_size--, cp += 3) - sprintf(cp, " %2.2x", *ucp); - log("Connection from %.100s with IP options:%.800s", - ntop, text); - packet_disconnect("Connection from %.100s with IP options:%.800s", - ntop, text); - } - } - - return xstrdup(name); -} - -/* - * Return the canonical name of the host in the other side of the current - * connection. The host name is cached, so it is efficient to call this - * several times. - */ - -const char * -get_canonical_hostname() -{ - static char *canonical_host_name = NULL; - - /* Check if we have previously retrieved this same name. */ - if (canonical_host_name != NULL) - return canonical_host_name; - - /* Get the real hostname if socket; otherwise return UNKNOWN. */ - if (packet_connection_is_on_socket()) - canonical_host_name = get_remote_hostname(packet_get_connection_in()); - else - canonical_host_name = xstrdup("UNKNOWN"); - - return canonical_host_name; -} - -/* - * Returns the IP-address of the remote host as a string. The returned - * string must not be freed. - */ - -const char * -get_remote_ipaddr() -{ - static char *canonical_host_ip = NULL; - struct sockaddr_storage from; - socklen_t fromlen; - int socket; - char ntop[NI_MAXHOST]; - - /* Check whether we have chached the name. */ - if (canonical_host_ip != NULL) - return canonical_host_ip; - - /* If not a socket, return UNKNOWN. */ - if (!packet_connection_is_on_socket()) { - canonical_host_ip = xstrdup("UNKNOWN"); - return canonical_host_ip; - } - /* Get client socket. */ - socket = packet_get_connection_in(); - - /* Get IP address of client. */ - fromlen = sizeof(from); - memset(&from, 0, sizeof(from)); - if (getpeername(socket, (struct sockaddr *) & from, &fromlen) < 0) { - debug("getpeername failed: %.100s", strerror(errno)); - fatal_cleanup(); - } - /* Get the IP address in ascii. */ - if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop), - NULL, 0, NI_NUMERICHOST) != 0) - fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed"); - - canonical_host_ip = xstrdup(ntop); - - /* Return ip address string. */ - return canonical_host_ip; -} - -/* Returns the local/remote port for the socket. */ - -int -get_sock_port(int sock, int local) -{ - struct sockaddr_storage from; - socklen_t fromlen; - char strport[NI_MAXSERV]; - - /* Get IP address of client. */ - fromlen = sizeof(from); - memset(&from, 0, sizeof(from)); - if (local) { - if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) { - error("getsockname failed: %.100s", strerror(errno)); - return 0; - } - } else { - if (getpeername(sock, (struct sockaddr *) & from, &fromlen) < 0) { - debug("getpeername failed: %.100s", strerror(errno)); - fatal_cleanup(); - } - } - /* Return port number. */ - if (getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0, - strport, sizeof(strport), NI_NUMERICSERV) != 0) - fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed"); - return atoi(strport); -} - -/* Returns remote/local port number for the current connection. */ - -int -get_port(int local) -{ - /* - * If the connection is not a socket, return 65535. This is - * intentionally chosen to be an unprivileged port number. - */ - if (!packet_connection_is_on_socket()) - return 65535; - - /* Get socket and return the port number. */ - return get_sock_port(packet_get_connection_in(), local); -} - -int -get_peer_port(int sock) -{ - return get_sock_port(sock, 0); -} - -int -get_remote_port() -{ - return get_port(0); -} - -int -get_local_port() -{ - return get_port(1); -} |