version 1.72.2.5, 2001/03/21 18:53:14 |
version 1.73, 2000/05/17 08:20:15 |
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* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* All rights reserved |
* All rights reserved |
|
* Created: Sat Mar 18 22:15:47 1995 ylo |
* Code to connect to a remote host, and to perform the client side of the |
* Code to connect to a remote host, and to perform the client side of the |
* login (authentication) dialog. |
* login (authentication) dialog. |
* |
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* As far as I am concerned, the code I have written for this software |
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* can be used freely for any purpose. Any derived versions of this |
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* software must be clearly marked as such, and if the derived work is |
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* incompatible with the protocol description in the RFC file, it must be |
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* called by a name other than "ssh" or "Secure Shell". |
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*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
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#include <openssl/bn.h> |
#include <openssl/bn.h> |
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#include <openssl/dsa.h> |
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#include <openssl/rsa.h> |
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#include "ssh.h" |
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#include "xmalloc.h" |
#include "xmalloc.h" |
#include "rsa.h" |
#include "rsa.h" |
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#include "ssh.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "packet.h" |
#include "packet.h" |
#include "uidswap.h" |
#include "uidswap.h" |
#include "compat.h" |
#include "compat.h" |
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#include "readconf.h" |
#include "key.h" |
#include "key.h" |
#include "sshconnect.h" |
#include "sshconnect.h" |
#include "hostfile.h" |
#include "hostfile.h" |
#include "log.h" |
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#include "readconf.h" |
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#include "atomicio.h" |
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#include "misc.h" |
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char *client_version_string = NULL; |
char *client_version_string = NULL; |
char *server_version_string = NULL; |
char *server_version_string = NULL; |
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extern Options options; |
extern Options options; |
extern char *__progname; |
extern char *__progname; |
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/* AF_UNSPEC or AF_INET or AF_INET6 */ |
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extern int IPv4or6; |
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/* |
/* |
* Connect to the given ssh server using a proxy command. |
* Connect to the given ssh server using a proxy command. |
*/ |
*/ |
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/* Stderr is left as it is so that error messages get |
/* Stderr is left as it is so that error messages get |
printed on the user's terminal. */ |
printed on the user's terminal. */ |
argv[0] = _PATH_BSHELL; |
argv[0] = "/bin/sh"; |
argv[1] = "-c"; |
argv[1] = "-c"; |
argv[2] = command_string; |
argv[2] = command_string; |
argv[3] = NULL; |
argv[3] = NULL; |
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/* Execute the proxy command. Note that we gave up any |
/* Execute the proxy command. Note that we gave up any |
extra privileges above. */ |
extra privileges above. */ |
execv(argv[0], argv); |
execv("/bin/sh", argv); |
perror(argv[0]); |
perror("/bin/sh"); |
exit(1); |
exit(1); |
} |
} |
/* Parent. */ |
/* Parent. */ |
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int anonymous, uid_t original_real_uid, |
int anonymous, uid_t original_real_uid, |
const char *proxy_command) |
const char *proxy_command) |
{ |
{ |
int gaierr; |
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int on = 1; |
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int sock = -1, attempt; |
int sock = -1, attempt; |
char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
struct servent *sp; |
struct addrinfo hints, *ai, *aitop; |
struct addrinfo hints, *ai, *aitop; |
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char ntop[NI_MAXHOST], strport[NI_MAXSERV]; |
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int gaierr; |
struct linger linger; |
struct linger linger; |
struct servent *sp; |
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debug("ssh_connect: getuid %u geteuid %u anon %d", |
debug("ssh_connect: getuid %d geteuid %d anon %d", |
(u_int) getuid(), (u_int) geteuid(), anonymous); |
(int) getuid(), (int) geteuid(), anonymous); |
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/* Get default port if port has not been set. */ |
/* Get default port if port has not been set. */ |
if (port == 0) { |
if (port == 0) { |
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/* Create a socket for connecting. */ |
/* Create a socket for connecting. */ |
sock = ssh_create_socket(original_real_uid, |
sock = ssh_create_socket(original_real_uid, |
!anonymous && geteuid() == 0, |
!anonymous && geteuid() == 0 && port < IPPORT_RESERVED, |
ai->ai_family); |
ai->ai_family); |
if (sock < 0) |
if (sock < 0) |
continue; |
continue; |
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temporarily_use_uid(original_real_uid); |
temporarily_use_uid(original_real_uid); |
if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) { |
if (connect(sock, ai->ai_addr, ai->ai_addrlen) >= 0) { |
/* Successful connection. */ |
/* Successful connection. */ |
memcpy(hostaddr, ai->ai_addr, ai->ai_addrlen); |
memcpy(hostaddr, ai->ai_addr, sizeof(*hostaddr)); |
restore_uid(); |
restore_uid(); |
break; |
break; |
} else { |
} else { |
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/* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
/* setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on)); */ |
linger.l_onoff = 1; |
linger.l_onoff = 1; |
linger.l_linger = 5; |
linger.l_linger = 5; |
setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *)&linger, sizeof(linger)); |
setsockopt(sock, SOL_SOCKET, SO_LINGER, (void *) &linger, sizeof(linger)); |
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/* Set keepalives if requested. */ |
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if (options.keepalives && |
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setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, |
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sizeof(on)) < 0) |
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error("setsockopt SO_KEEPALIVE: %.100s", strerror(errno)); |
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/* Set the connection. */ |
/* Set the connection. */ |
packet_set_connection(sock, sock); |
packet_set_connection(sock, sock); |
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* identification string. |
* identification string. |
*/ |
*/ |
void |
void |
ssh_exchange_identification(void) |
ssh_exchange_identification() |
{ |
{ |
char buf[256], remote_version[256]; /* must be same size! */ |
char buf[256], remote_version[256]; /* must be same size! */ |
int remote_major, remote_minor, i, mismatch; |
int remote_major, remote_minor, i, mismatch; |
int connection_in = packet_get_connection_in(); |
int connection_in = packet_get_connection_in(); |
int connection_out = packet_get_connection_out(); |
int connection_out = packet_get_connection_out(); |
int minor1 = PROTOCOL_MINOR_1; |
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/* Read other side\'s version identification. */ |
/* Read other side\'s version identification. */ |
for (;;) { |
for (i = 0; i < sizeof(buf) - 1; i++) { |
for (i = 0; i < sizeof(buf) - 1; i++) { |
int len = read(connection_in, &buf[i], 1); |
int len = atomicio(read, connection_in, &buf[i], 1); |
if (len < 0) |
if (len < 0) |
fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); |
fatal("ssh_exchange_identification: read: %.100s", strerror(errno)); |
if (len != 1) |
if (len != 1) |
fatal("ssh_exchange_identification: Connection closed by remote host"); |
fatal("ssh_exchange_identification: Connection closed by remote host"); |
if (buf[i] == '\r') { |
if (buf[i] == '\r') { |
buf[i] = '\n'; |
buf[i] = '\n'; |
buf[i + 1] = 0; |
buf[i + 1] = 0; |
continue; /**XXX wait for \n */ |
continue; /**XXX wait for \n */ |
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} |
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if (buf[i] == '\n') { |
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buf[i + 1] = 0; |
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break; |
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} |
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} |
} |
buf[sizeof(buf) - 1] = 0; |
if (buf[i] == '\n') { |
if (strncmp(buf, "SSH-", 4) == 0) |
buf[i + 1] = 0; |
break; |
break; |
debug("ssh_exchange_identification: %s", buf); |
} |
} |
} |
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buf[sizeof(buf) - 1] = 0; |
server_version_string = xstrdup(buf); |
server_version_string = xstrdup(buf); |
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/* |
/* |
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} |
} |
if (remote_minor < 3) { |
if (remote_minor < 3) { |
fatal("Remote machine has too old SSH software version."); |
fatal("Remote machine has too old SSH software version."); |
} else if (remote_minor == 3 || remote_minor == 4) { |
} else if (remote_minor == 3) { |
/* We speak 1.3, too. */ |
/* We speak 1.3, too. */ |
enable_compat13(); |
enable_compat13(); |
minor1 = 3; |
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if (options.forward_agent) { |
if (options.forward_agent) { |
log("Agent forwarding disabled for protocol 1.3"); |
log("Agent forwarding disabled for protocol 1.3"); |
options.forward_agent = 0; |
options.forward_agent = 0; |
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/* Send our own protocol version identification. */ |
/* Send our own protocol version identification. */ |
snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
snprintf(buf, sizeof buf, "SSH-%d.%d-%.100s\n", |
compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
compat20 ? PROTOCOL_MAJOR_2 : PROTOCOL_MAJOR_1, |
compat20 ? PROTOCOL_MINOR_2 : minor1, |
compat20 ? PROTOCOL_MINOR_2 : PROTOCOL_MINOR_1, |
SSH_VERSION); |
SSH_VERSION); |
if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf)) |
if (atomicio(write, connection_out, buf, strlen(buf)) != strlen(buf)) |
fatal("write: %.100s", strerror(errno)); |
fatal("write: %.100s", strerror(errno)); |
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debug("Local version string %.100s", client_version_string); |
debug("Local version string %.100s", client_version_string); |
} |
} |
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/* defaults to 'no' */ |
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int |
int |
read_yes_or_no(const char *prompt, int defval) |
read_yes_or_no(const char *prompt, int defval) |
{ |
{ |
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FILE *f; |
FILE *f; |
int retval = -1; |
int retval = -1; |
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if (options.batch_mode) |
if (isatty(0)) |
return 0; |
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if (isatty(STDIN_FILENO)) |
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f = stdin; |
f = stdin; |
else |
else |
f = fopen(_PATH_TTY, "rw"); |
f = fopen("/dev/tty", "rw"); |
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if (f == NULL) |
if (f == NULL) |
return 0; |
return 0; |
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retval = defval; |
retval = defval; |
if (strcmp(buf, "yes") == 0) |
if (strcmp(buf, "yes") == 0) |
retval = 1; |
retval = 1; |
else if (strcmp(buf, "no") == 0) |
if (strcmp(buf, "no") == 0) |
retval = 0; |
retval = 0; |
else |
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fprintf(stderr, "Please type 'yes' or 'no'.\n"); |
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if (retval != -1) { |
if (retval != -1) { |
if (f != stdin) |
if (f != stdin) |
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Key *file_key; |
Key *file_key; |
char *type = key_type(host_key); |
char *type = key_type(host_key); |
char *ip = NULL; |
char *ip = NULL; |
char hostline[1000], *hostp, *fp; |
char hostline[1000], *hostp; |
HostStatus host_status; |
HostStatus host_status; |
HostStatus ip_status; |
HostStatus ip_status; |
int local = 0, host_ip_differ = 0; |
int local = 0, host_ip_differ = 0; |
char ntop[NI_MAXHOST]; |
char ntop[NI_MAXHOST]; |
int host_line, ip_line; |
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const char *host_file = NULL, *ip_file = NULL; |
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/* |
/* |
* Force accepting of the host key for loopback/localhost. The |
* Force accepting of the host key for loopback/localhost. The |
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local = 0; |
local = 0; |
break; |
break; |
} |
} |
if (local && options.host_key_alias == NULL) { |
if (local) { |
debug("Forcing accepting of host key for " |
debug("Forcing accepting of host key for loopback/localhost."); |
"loopback/localhost."); |
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return; |
return; |
} |
} |
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/* |
/* |
* We don't have the remote ip-address for connections |
* Turn off check_host_ip for proxy connects, since |
* using a proxy command |
* we don't have the remote ip-address |
*/ |
*/ |
if (options.proxy_command == NULL) { |
if (options.proxy_command != NULL && options.check_host_ip) |
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options.check_host_ip = 0; |
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if (options.check_host_ip) { |
if (getnameinfo(hostaddr, hostaddr->sa_len, ntop, sizeof(ntop), |
if (getnameinfo(hostaddr, hostaddr->sa_len, ntop, sizeof(ntop), |
NULL, 0, NI_NUMERICHOST) != 0) |
NULL, 0, NI_NUMERICHOST) != 0) |
fatal("check_host_key: getnameinfo failed"); |
fatal("check_host_key: getnameinfo failed"); |
ip = xstrdup(ntop); |
ip = xstrdup(ntop); |
} else { |
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ip = xstrdup("<no hostip for proxy command>"); |
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} |
} |
/* |
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* Turn off check_host_ip if the connection is to localhost, via proxy |
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* command or if we don't have a hostname to compare with |
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*/ |
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if (options.check_host_ip && |
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(local || strcmp(host, ip) == 0 || options.proxy_command != NULL)) |
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options.check_host_ip = 0; |
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/* |
/* |
* Allow the user to record the key under a different name. This is |
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* useful for ssh tunneling over forwarded connections or if you run |
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* multiple sshd's on different ports on the same machine. |
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*/ |
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if (options.host_key_alias != NULL) { |
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host = options.host_key_alias; |
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debug("using hostkeyalias: %s", host); |
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} |
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/* |
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* Store the host key from the known host file in here so that we can |
* Store the host key from the known host file in here so that we can |
* compare it with the key for the IP address. |
* compare it with the key for the IP address. |
*/ |
*/ |
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* Check if the host key is present in the user\'s list of known |
* Check if the host key is present in the user\'s list of known |
* hosts or in the systemwide list. |
* hosts or in the systemwide list. |
*/ |
*/ |
host_file = user_hostfile; |
host_status = check_host_in_hostfile(user_hostfile, host, host_key, file_key); |
host_status = check_host_in_hostfile(host_file, host, host_key, file_key, &host_line); |
if (host_status == HOST_NEW) |
if (host_status == HOST_NEW) { |
host_status = check_host_in_hostfile(system_hostfile, host, host_key, file_key); |
host_file = system_hostfile; |
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host_status = check_host_in_hostfile(host_file, host, host_key, file_key, &host_line); |
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} |
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/* |
/* |
* Also perform check for the ip address, skip the check if we are |
* Also perform check for the ip address, skip the check if we are |
* localhost or the hostname was an ip address to begin with |
* localhost or the hostname was an ip address to begin with |
*/ |
*/ |
if (options.check_host_ip) { |
if (options.check_host_ip && !local && strcmp(host, ip)) { |
Key *ip_key = key_new(host_key->type); |
Key *ip_key = key_new(host_key->type); |
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ip_status = check_host_in_hostfile(user_hostfile, ip, host_key, ip_key); |
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ip_file = user_hostfile; |
if (ip_status == HOST_NEW) |
ip_status = check_host_in_hostfile(ip_file, ip, host_key, ip_key, &ip_line); |
ip_status = check_host_in_hostfile(system_hostfile, ip, host_key, ip_key); |
if (ip_status == HOST_NEW) { |
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ip_file = system_hostfile; |
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ip_status = check_host_in_hostfile(ip_file, ip, host_key, ip_key, &ip_line); |
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} |
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if (host_status == HOST_CHANGED && |
if (host_status == HOST_CHANGED && |
(ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
(ip_status != HOST_CHANGED || !key_equal(ip_key, file_key))) |
host_ip_differ = 1; |
host_ip_differ = 1; |
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/* The host is known and the key matches. */ |
/* The host is known and the key matches. */ |
debug("Host '%.200s' is known and matches the %s host key.", |
debug("Host '%.200s' is known and matches the %s host key.", |
host, type); |
host, type); |
debug("Found key in %s:%d", host_file, host_line); |
if (options.check_host_ip) { |
if (options.check_host_ip && ip_status == HOST_NEW) { |
if (ip_status == HOST_NEW) { |
if (!add_host_to_hostfile(user_hostfile, ip, host_key)) |
if (!add_host_to_hostfile(user_hostfile, ip, host_key)) |
log("Failed to add the %s host key for IP address '%.128s' to the list of known hosts (%.30s).", |
log("Failed to add the %s host key for IP address '%.30s' to the list of known hosts (%.30s).", |
type, ip, user_hostfile); |
type, ip, user_hostfile); |
else |
else |
log("Warning: Permanently added the %s host key for IP address '%.128s' to the list of known hosts.", |
log("Warning: Permanently added the %s host key for IP address '%.30s' to the list of known hosts.", |
type, ip); |
type, ip); |
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} else if (ip_status != HOST_OK) |
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log("Warning: the %s host key for '%.200s' differs from the key for the IP address '%.30s'", |
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type, host, ip); |
} |
} |
break; |
break; |
case HOST_NEW: |
case HOST_NEW: |
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} else if (options.strict_host_key_checking == 2) { |
} else if (options.strict_host_key_checking == 2) { |
/* The default */ |
/* The default */ |
char prompt[1024]; |
char prompt[1024]; |
fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
char *fp = key_fingerprint(host_key); |
snprintf(prompt, sizeof(prompt), |
snprintf(prompt, sizeof(prompt), |
"The authenticity of host '%.200s (%s)' can't be established.\n" |
"The authenticity of host '%.200s' can't be established.\n" |
"%s key fingerprint is %s.\n" |
"%s key fingerprint is %s.\n" |
"Are you sure you want to continue connecting (yes/no)? ", |
"Are you sure you want to continue connecting (yes/no)? ", |
host, ip, type, fp); |
host, type, fp); |
xfree(fp); |
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if (!read_yes_or_no(prompt, -1)) |
if (!read_yes_or_no(prompt, -1)) |
fatal("Aborted by user!"); |
fatal("Aborted by user!\n"); |
} |
} |
if (options.check_host_ip && ip_status == HOST_NEW) { |
if (options.check_host_ip && ip_status == HOST_NEW && strcmp(host, ip)) { |
snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
snprintf(hostline, sizeof(hostline), "%s,%s", host, ip); |
hostp = hostline; |
hostp = hostline; |
} else |
} else |
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error("and the key for the according IP address %s", ip); |
error("and the key for the according IP address %s", ip); |
error("%s. This could either mean that", msg); |
error("%s. This could either mean that", msg); |
error("DNS SPOOFING is happening or the IP address for the host"); |
error("DNS SPOOFING is happening or the IP address for the host"); |
error("and its host key have changed at the same time."); |
error("and its host key have changed at the same time"); |
if (ip_status != HOST_NEW) |
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error("Offending key for IP in %s:%d", ip_file, ip_line); |
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} |
} |
/* The host key has changed. */ |
/* The host key has changed. */ |
fp = key_fingerprint(host_key, SSH_FP_MD5, SSH_FP_HEX); |
|
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
error("@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@"); |
error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
error("IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!"); |
error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); |
error("Someone could be eavesdropping on you right now (man-in-the-middle attack)!"); |
error("It is also possible that the %s host key has just been changed.", type); |
error("It is also possible that the %s host key has just been changed.", type); |
error("The fingerprint for the %s key sent by the remote host is\n%s.", |
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type, fp); |
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error("Please contact your system administrator."); |
error("Please contact your system administrator."); |
error("Add correct host key in %.100s to get rid of this message.", |
error("Add correct host key in %.100s to get rid of this message.", |
user_hostfile); |
user_hostfile); |
error("Offending key in %s:%d", host_file, host_line); |
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xfree(fp); |
|
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/* |
/* |
* If strict host key checking is in use, the user will have |
* If strict host key checking is in use, the user will have |
|
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error("Agent forwarding is disabled to avoid trojan horses."); |
error("Agent forwarding is disabled to avoid trojan horses."); |
options.forward_agent = 0; |
options.forward_agent = 0; |
} |
} |
if (options.forward_x11) { |
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error("X11 forwarding is disabled to avoid trojan horses."); |
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options.forward_x11 = 0; |
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} |
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if (options.num_local_forwards > 0 || options.num_remote_forwards > 0) { |
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error("Port forwarding is disabled to avoid trojan horses."); |
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options.num_local_forwards = options.num_remote_forwards = 0; |
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} |
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/* |
/* |
* XXX Should permit the user to change to use the new id. |
* XXX Should permit the user to change to use the new id. |
* This could be done by converting the host key to an |
* This could be done by converting the host key to an |
|
|
*/ |
*/ |
break; |
break; |
} |
} |
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if (options.check_host_ip) |
if (options.check_host_ip && host_status != HOST_CHANGED && |
xfree(ip); |
ip_status == HOST_CHANGED) { |
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log("Warning: the %s host key for '%.200s' " |
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"differs from the key for the IP address '%.128s'", |
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type, host, ip); |
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if (host_status == HOST_OK) |
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log("Matching host key in %s:%d", host_file, host_line); |
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log("Offending key for IP in %s:%d", ip_file, ip_line); |
|
if (options.strict_host_key_checking == 1) { |
|
fatal("Exiting, you have requested strict checking."); |
|
} else if (options.strict_host_key_checking == 2) { |
|
if (!read_yes_or_no("Are you sure you want " \ |
|
"to continue connecting (yes/no)? ", -1)) |
|
fatal("Aborted by user!"); |
|
} |
|
} |
|
|
|
xfree(ip); |
|
} |
} |
|
|
/* |
/* |
|
|
/* Get local user name. Use it as server user if no user name was given. */ |
/* Get local user name. Use it as server user if no user name was given. */ |
pw = getpwuid(original_real_uid); |
pw = getpwuid(original_real_uid); |
if (!pw) |
if (!pw) |
fatal("User id %u not found from user database.", original_real_uid); |
fatal("User id %d not found from user database.", original_real_uid); |
local_user = xstrdup(pw->pw_name); |
local_user = xstrdup(pw->pw_name); |
server_user = options.user ? options.user : local_user; |
server_user = options.user ? options.user : local_user; |
|
|
|
|
ssh_kex(host, hostaddr); |
ssh_kex(host, hostaddr); |
ssh_userauth(local_user, server_user, host, host_key_valid, own_host_key); |
ssh_userauth(local_user, server_user, host, host_key_valid, own_host_key); |
} |
} |
} |
|
|
|
void |
|
ssh_put_password(char *password) |
|
{ |
|
int size; |
|
char *padded; |
|
|
|
if (datafellows & SSH_BUG_PASSWORDPAD) { |
|
packet_put_string(password, strlen(password)); |
|
return; |
|
} |
|
size = roundup(strlen(password) + 1, 32); |
|
padded = xmalloc(size); |
|
memset(padded, 0, size); |
|
strlcpy(padded, password, size); |
|
packet_put_string(padded, size); |
|
memset(padded, 0, size); |
|
xfree(padded); |
|
} |
} |