1 files changed, 298 insertions, 0 deletions

diff --git a/other/openssh-2.1.1p4/canohost.c b/other/openssh-2.1.1p4/canohost.c
new file mode 100644
index 0000000..7ded0e3
--- /dev/null
+++ b/other/openssh-2.1.1p4/canohost.c
@@ -0,0 +1,298 @@
+/*
+ *
+ * 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("$OpenBSD: canohost.c,v 1.13 2000/06/20 01:39:39 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();
+        }
+
+#ifdef IPV4_IN_IPV6
+        if (from.ss_family == AF_INET6) {
+                struct sockaddr_in6 *from6 = (struct sockaddr_in6 *)&from;
+
+                /* Detect IPv4 in IPv6 mapped address and convert it to */
+                /* plain (AF_INET) IPv4 address */
+                if (IN6_IS_ADDR_V4MAPPED(&from6->sin6_addr)) {
+                        struct sockaddr_in *from4 = (struct sockaddr_in *)&from;
+                        struct in_addr addr;
+                        u_int16_t port;
+
+                        memcpy(&addr, ((char *)&from6->sin6_addr) + 12, sizeof(addr));
+                        port = from6->sin6_port;
+
+                        memset(&from, 0, sizeof(from));
+                        
+                        from4->sin_family = AF_INET;
+                        memcpy(&from4->sin_addr, &addr, sizeof(addr));
+                        from4->sin_port = port;
+                }
+        }
+#endif
+
+        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);
+}