version 1.69, 2000/10/27 07:32:19 |
version 1.69.2.4, 2001/05/07 21:09:36 |
|
|
RCSID("$OpenBSD$"); |
RCSID("$OpenBSD$"); |
|
|
#include <openssl/evp.h> |
#include <openssl/evp.h> |
#include <openssl/dsa.h> |
#include <openssl/err.h> |
#include <openssl/rsa.h> |
|
|
|
#include "xmalloc.h" |
|
#include "ssh.h" |
#include "ssh.h" |
|
#include "ssh1.h" |
|
#include "ssh2.h" |
|
#include "compat.h" |
|
#include "cipher.h" |
|
#include "xmalloc.h" |
#include "packet.h" |
#include "packet.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "readconf.h" |
|
#include "uidswap.h" |
#include "uidswap.h" |
|
|
#include "ssh2.h" |
|
#include "compat.h" |
|
#include "channels.h" |
#include "channels.h" |
#include "key.h" |
#include "key.h" |
#include "authfd.h" |
#include "authfd.h" |
#include "authfile.h" |
#include "authfile.h" |
|
#include "pathnames.h" |
|
#include "clientloop.h" |
|
#include "log.h" |
|
#include "readconf.h" |
|
#include "sshconnect.h" |
|
#include "tildexpand.h" |
|
#include "dispatch.h" |
|
#include "misc.h" |
|
#include "kex.h" |
|
#include "mac.h" |
|
#include "sshtty.h" |
|
|
extern char *__progname; |
extern char *__progname; |
|
|
|
|
|
|
/* Flag indicating whether a tty should be allocated */ |
/* Flag indicating whether a tty should be allocated */ |
int tty_flag = 0; |
int tty_flag = 0; |
|
int no_tty_flag = 0; |
|
int force_tty_flag = 0; |
|
|
/* don't exec a shell */ |
/* don't exec a shell */ |
int no_shell_flag = 0; |
int no_shell_flag = 0; |
int no_tty_flag = 0; |
|
|
|
/* |
/* |
* Flag indicating that nothing should be read from stdin. This can be set |
* Flag indicating that nothing should be read from stdin. This can be set |
|
|
*/ |
*/ |
volatile int received_window_change_signal = 0; |
volatile int received_window_change_signal = 0; |
|
|
/* Value of argv[0] (set in the main program). */ |
/* Private host keys. */ |
char *av0; |
struct { |
|
Key **keys; |
|
int nkeys; |
|
} sensitive_data; |
|
|
/* Flag indicating whether we have a valid host private key loaded. */ |
|
int host_private_key_loaded = 0; |
|
|
|
/* Host private key. */ |
|
RSA *host_private_key = NULL; |
|
|
|
/* Original real UID. */ |
/* Original real UID. */ |
uid_t original_real_uid; |
uid_t original_real_uid; |
|
|
/* command to be executed */ |
/* command to be executed */ |
Buffer command; |
Buffer command; |
|
|
|
/* Should we execute a command or invoke a subsystem? */ |
|
int subsystem_flag = 0; |
|
|
/* Prints a help message to the user. This function never returns. */ |
/* Prints a help message to the user. This function never returns. */ |
|
|
void |
void |
usage() |
usage(void) |
{ |
{ |
fprintf(stderr, "Usage: %s [options] host [command]\n", av0); |
fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
fprintf(stderr, "Options:\n"); |
fprintf(stderr, "Options:\n"); |
fprintf(stderr, " -l user Log in using this user name.\n"); |
fprintf(stderr, " -l user Log in using this user name.\n"); |
fprintf(stderr, " -n Redirect input from /dev/null.\n"); |
fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
#ifdef AFS |
#ifdef AFS |
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
#endif /* AFS */ |
#endif /* AFS */ |
fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n"); |
fprintf(stderr, " -i file Identity for public key authentication " |
|
"(default: ~/.ssh/identity)\n"); |
fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n"); |
fprintf(stderr, " -T Do not allocate a tty.\n"); |
fprintf(stderr, " -T Do not allocate a tty.\n"); |
fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
|
|
fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); |
fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n"); |
|
|
fprintf(stderr, " -c cipher Select encryption algorithm: " |
fprintf(stderr, " -c cipher Select encryption algorithm: " |
"``3des'', " |
"``3des'', ``blowfish''\n"); |
"``blowfish''\n"); |
fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\n"); |
fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n"); |
fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); |
fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n"); |
fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); |
fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n"); |
fprintf(stderr, " These cause %s to listen for connections on a port, and\n", av0); |
fprintf(stderr, " These cause %s to listen for connections on a port, and\n", __progname); |
fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
fprintf(stderr, " forward them to the other side by connecting to host:port.\n"); |
fprintf(stderr, " -C Enable compression.\n"); |
fprintf(stderr, " -C Enable compression.\n"); |
fprintf(stderr, " -N Do not execute a shell or command.\n"); |
fprintf(stderr, " -N Do not execute a shell or command.\n"); |
fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n"); |
|
fprintf(stderr, " -1 Force protocol version 1.\n"); |
|
fprintf(stderr, " -2 Force protocol version 2.\n"); |
fprintf(stderr, " -4 Use IPv4 only.\n"); |
fprintf(stderr, " -4 Use IPv4 only.\n"); |
fprintf(stderr, " -6 Use IPv6 only.\n"); |
fprintf(stderr, " -6 Use IPv6 only.\n"); |
fprintf(stderr, " -2 Force protocol version 2.\n"); |
|
fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
|
fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
exit(1); |
exit(1); |
} |
} |
|
|
|
|
exit(1); |
exit(1); |
} |
} |
|
|
int ssh_session(void); |
int ssh_session(void); |
int ssh_session2(void); |
int ssh_session2(void); |
|
void load_public_identity_files(void); |
|
|
/* |
/* |
* Main program for the ssh client. |
* Main program for the ssh client. |
|
|
u_short fwd_port, fwd_host_port; |
u_short fwd_port, fwd_host_port; |
char *optarg, *cp, buf[256]; |
char *optarg, *cp, buf[256]; |
struct stat st; |
struct stat st; |
struct passwd *pw, pwcopy; |
struct passwd *pw; |
int dummy; |
int dummy; |
uid_t original_effective_uid; |
uid_t original_effective_uid; |
|
|
|
|
if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
if (setrlimit(RLIMIT_CORE, &rlim) < 0) |
fatal("setrlimit failed: %.100s", strerror(errno)); |
fatal("setrlimit failed: %.100s", strerror(errno)); |
} |
} |
|
/* Get user data. */ |
|
pw = getpwuid(original_real_uid); |
|
if (!pw) { |
|
log("You don't exist, go away!"); |
|
exit(1); |
|
} |
|
/* Take a copy of the returned structure. */ |
|
pw = pwcopy(pw); |
|
|
/* |
/* |
* Use uid-swapping to give up root privileges for the duration of |
* Use uid-swapping to give up root privileges for the duration of |
* option processing. We will re-instantiate the rights when we are |
* option processing. We will re-instantiate the rights when we are |
|
|
* them when the port has been created (actually, when the connection |
* them when the port has been created (actually, when the connection |
* has been made, as we may need to create the port several times). |
* has been made, as we may need to create the port several times). |
*/ |
*/ |
temporarily_use_uid(original_real_uid); |
temporarily_use_uid(pw); |
|
|
/* |
/* |
* Set our umask to something reasonable, as some files are created |
* Set our umask to something reasonable, as some files are created |
|
|
*/ |
*/ |
umask(022); |
umask(022); |
|
|
/* Save our own name. */ |
|
av0 = av[0]; |
|
|
|
/* Initialize option structure to indicate that no values have been set. */ |
/* Initialize option structure to indicate that no values have been set. */ |
initialize_options(&options); |
initialize_options(&options); |
|
|
/* Parse command-line arguments. */ |
/* Parse command-line arguments. */ |
host = NULL; |
host = NULL; |
|
|
/* If program name is not one of the standard names, use it as host name. */ |
|
if (strchr(av0, '/')) |
|
cp = strrchr(av0, '/') + 1; |
|
else |
|
cp = av0; |
|
if (strcmp(cp, "rsh") && strcmp(cp, "ssh") && strcmp(cp, "rlogin") && |
|
strcmp(cp, "slogin") && strcmp(cp, "remsh")) |
|
host = cp; |
|
|
|
for (optind = 1; optind < ac; optind++) { |
for (optind = 1; optind < ac; optind++) { |
if (av[optind][0] != '-') { |
if (av[optind][0] != '-') { |
if (host) |
if (host) |
|
|
opt = av[optind][1]; |
opt = av[optind][1]; |
if (!opt) |
if (!opt) |
usage(); |
usage(); |
if (strchr("eilcpLRo", opt)) { /* options with arguments */ |
if (strchr("eilcmpLRDo", opt)) { /* options with arguments */ |
optarg = av[optind] + 2; |
optarg = av[optind] + 2; |
if (strcmp(optarg, "") == 0) { |
if (strcmp(optarg, "") == 0) { |
if (optind >= ac - 1) |
if (optind >= ac - 1) |
|
|
optarg = NULL; |
optarg = NULL; |
} |
} |
switch (opt) { |
switch (opt) { |
|
case '1': |
|
options.protocol = SSH_PROTO_1; |
|
break; |
case '2': |
case '2': |
options.protocol = SSH_PROTO_2; |
options.protocol = SSH_PROTO_2; |
break; |
break; |
|
|
case 'i': |
case 'i': |
if (stat(optarg, &st) < 0) { |
if (stat(optarg, &st) < 0) { |
fprintf(stderr, "Warning: Identity file %s does not exist.\n", |
fprintf(stderr, "Warning: Identity file %s does not exist.\n", |
optarg); |
optarg); |
break; |
break; |
} |
} |
if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) |
if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) |
fatal("Too many identity files specified (max %d)", |
fatal("Too many identity files specified (max %d)", |
SSH_MAX_IDENTITY_FILES); |
SSH_MAX_IDENTITY_FILES); |
options.identity_files[options.num_identity_files++] = |
options.identity_files[options.num_identity_files++] = xstrdup(optarg); |
xstrdup(optarg); |
|
break; |
break; |
case 't': |
case 't': |
|
if (tty_flag) |
|
force_tty_flag = 1; |
tty_flag = 1; |
tty_flag = 1; |
break; |
break; |
case 'v': |
case 'v': |
|
|
options.log_level++; |
options.log_level++; |
break; |
break; |
} else { |
} else { |
fatal("Too high debugging level.\n"); |
fatal("Too high debugging level."); |
} |
} |
/* fallthrough */ |
/* fallthrough */ |
case 'V': |
case 'V': |
fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
fprintf(stderr, |
|
"%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", |
SSH_VERSION, |
SSH_VERSION, |
PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, |
PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, |
PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); |
PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
SSLeay()); |
if (opt == 'V') |
if (opt == 'V') |
exit(0); |
exit(0); |
break; |
break; |
|
|
break; |
break; |
case 'e': |
case 'e': |
if (optarg[0] == '^' && optarg[2] == 0 && |
if (optarg[0] == '^' && optarg[2] == 0 && |
(unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128) |
(u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
options.escape_char = (unsigned char) optarg[1] & 31; |
options.escape_char = (u_char) optarg[1] & 31; |
else if (strlen(optarg) == 1) |
else if (strlen(optarg) == 1) |
options.escape_char = (unsigned char) optarg[0]; |
options.escape_char = (u_char) optarg[0]; |
else if (strcmp(optarg, "none") == 0) |
else if (strcmp(optarg, "none") == 0) |
options.escape_char = -2; |
options.escape_char = -2; |
else { |
else { |
|
|
options.cipher = SSH_CIPHER_ILLEGAL; |
options.cipher = SSH_CIPHER_ILLEGAL; |
} else { |
} else { |
/* SSH1 only */ |
/* SSH1 only */ |
Cipher *c = cipher_by_name(optarg); |
options.cipher = cipher_number(optarg); |
if (c == NULL || c->number < 0) { |
if (options.cipher == -1) { |
fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
exit(1); |
exit(1); |
} |
} |
options.cipher = c->number; |
if (options.cipher == SSH_CIPHER_3DES) { |
|
options.ciphers = "3des-cbc"; |
|
} else if (options.cipher == SSH_CIPHER_BLOWFISH) { |
|
options.ciphers = "blowfish-cbc"; |
|
} else { |
|
options.ciphers = (char *)-1; |
|
} |
} |
} |
break; |
break; |
|
case 'm': |
|
if (mac_valid(optarg)) |
|
options.macs = xstrdup(optarg); |
|
else { |
|
fprintf(stderr, "Unknown mac type '%s'\n", optarg); |
|
exit(1); |
|
} |
|
break; |
case 'p': |
case 'p': |
options.port = atoi(optarg); |
options.port = a2port(optarg); |
|
if (options.port == 0) { |
|
fprintf(stderr, "Bad port '%s'\n", optarg); |
|
exit(1); |
|
} |
break; |
break; |
case 'l': |
case 'l': |
options.user = optarg; |
options.user = optarg; |
|
|
} |
} |
add_local_forward(&options, fwd_port, buf, fwd_host_port); |
add_local_forward(&options, fwd_port, buf, fwd_host_port); |
break; |
break; |
|
|
|
case 'D': |
|
fwd_port = a2port(optarg); |
|
if (fwd_port == 0) { |
|
fprintf(stderr, "Bad dynamic port '%s'\n", optarg); |
|
exit(1); |
|
} |
|
add_local_forward(&options, fwd_port, "socks4", 0); |
|
break; |
|
|
case 'C': |
case 'C': |
options.compression = 1; |
options.compression = 1; |
break; |
break; |
|
|
"command-line", 0, &dummy) != 0) |
"command-line", 0, &dummy) != 0) |
exit(1); |
exit(1); |
break; |
break; |
|
case 's': |
|
subsystem_flag = 1; |
|
break; |
default: |
default: |
usage(); |
usage(); |
} |
} |
|
|
usage(); |
usage(); |
|
|
SSLeay_add_all_algorithms(); |
SSLeay_add_all_algorithms(); |
|
ERR_load_crypto_strings(); |
|
|
/* Initialize the command to execute on remote host. */ |
/* Initialize the command to execute on remote host. */ |
buffer_init(&command); |
buffer_init(&command); |
|
|
if (optind == ac) { |
if (optind == ac) { |
/* No command specified - execute shell on a tty. */ |
/* No command specified - execute shell on a tty. */ |
tty_flag = 1; |
tty_flag = 1; |
|
if (subsystem_flag) { |
|
fprintf(stderr, "You must specify a subsystem to invoke.\n"); |
|
usage(); |
|
} |
} else { |
} else { |
/* A command has been specified. Store it into the |
/* A command has been specified. Store it into the |
buffer. */ |
buffer. */ |
|
|
if (buffer_len(&command) == 0) |
if (buffer_len(&command) == 0) |
tty_flag = 1; |
tty_flag = 1; |
|
|
|
/* Force no tty*/ |
|
if (no_tty_flag) |
|
tty_flag = 0; |
/* Do not allocate a tty if stdin is not a tty. */ |
/* Do not allocate a tty if stdin is not a tty. */ |
if (!isatty(fileno(stdin))) { |
if (!isatty(fileno(stdin)) && !force_tty_flag) { |
if (tty_flag) |
if (tty_flag) |
fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
log("Pseudo-terminal will not be allocated because stdin is not a terminal."); |
tty_flag = 0; |
tty_flag = 0; |
} |
} |
/* force */ |
|
if (no_tty_flag) |
|
tty_flag = 0; |
|
|
|
/* Get user data. */ |
/* |
pw = getpwuid(original_real_uid); |
* Initialize "log" output. Since we are the client all output |
if (!pw) { |
* actually goes to stderr. |
fprintf(stderr, "You don't exist, go away!\n"); |
*/ |
exit(1); |
log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level, |
} |
SYSLOG_FACILITY_USER, 1); |
/* Take a copy of the returned structure. */ |
|
memset(&pwcopy, 0, sizeof(pwcopy)); |
|
pwcopy.pw_name = xstrdup(pw->pw_name); |
|
pwcopy.pw_passwd = xstrdup(pw->pw_passwd); |
|
pwcopy.pw_uid = pw->pw_uid; |
|
pwcopy.pw_gid = pw->pw_gid; |
|
pwcopy.pw_class = xstrdup(pw->pw_class); |
|
pwcopy.pw_dir = xstrdup(pw->pw_dir); |
|
pwcopy.pw_shell = xstrdup(pw->pw_shell); |
|
pw = &pwcopy; |
|
|
|
/* Initialize "log" output. Since we are the client all output |
|
actually goes to the terminal. */ |
|
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
|
|
|
/* Read per-user configuration file. */ |
/* Read per-user configuration file. */ |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
read_config_file(buf, host, &options); |
read_config_file(buf, host, &options); |
|
|
/* Read systemwide configuration file. */ |
/* Read systemwide configuration file. */ |
read_config_file(HOST_CONFIG_FILE, host, &options); |
read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
|
|
/* Fill configuration defaults. */ |
/* Fill configuration defaults. */ |
fill_default_options(&options); |
fill_default_options(&options); |
|
|
/* reinit */ |
/* reinit */ |
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1); |
|
|
/* check if RSA support exists */ |
|
if ((options.protocol & SSH_PROTO_1) && |
|
rsa_alive() == 0) { |
|
log("%s: no RSA support in libssl and libcrypto. See ssl(8).", |
|
__progname); |
|
log("Disabling protocol version 1"); |
|
options.protocol &= ~ (SSH_PROTO_1|SSH_PROTO_1_PREFERRED); |
|
} |
|
if (! options.protocol & (SSH_PROTO_1|SSH_PROTO_2)) { |
|
fprintf(stderr, "%s: No protocol version available.\n", |
|
__progname); |
|
exit(1); |
|
} |
|
|
|
if (options.user == NULL) |
if (options.user == NULL) |
options.user = xstrdup(pw->pw_name); |
options.user = xstrdup(pw->pw_name); |
|
|
|
|
|
|
/* Disable rhosts authentication if not running as root. */ |
/* Disable rhosts authentication if not running as root. */ |
if (original_effective_uid != 0 || !options.use_privileged_port) { |
if (original_effective_uid != 0 || !options.use_privileged_port) { |
|
debug("Rhosts Authentication disabled, " |
|
"originating port will not be trusted."); |
options.rhosts_authentication = 0; |
options.rhosts_authentication = 0; |
options.rhosts_rsa_authentication = 0; |
|
} |
} |
/* |
/* |
* If using rsh has been selected, exec it now (without trying |
* If using rsh has been selected, exec it now (without trying |
|
|
restore_uid(); |
restore_uid(); |
|
|
/* Switch to the original uid permanently. */ |
/* Switch to the original uid permanently. */ |
permanently_set_uid(original_real_uid); |
permanently_set_uid(pw); |
|
|
/* Execute rsh. */ |
/* Execute rsh. */ |
rsh_connect(host, options.user, &command); |
rsh_connect(host, options.user, &command); |
|
|
/* Restore our superuser privileges. */ |
/* Restore our superuser privileges. */ |
restore_uid(); |
restore_uid(); |
|
|
/* |
/* Open a connection to the remote host. */ |
* Open a connection to the remote host. This needs root privileges |
|
* if rhosts_{rsa_}authentication is enabled. |
|
*/ |
|
|
|
ok = ssh_connect(host, &hostaddr, options.port, |
ok = ssh_connect(host, &hostaddr, options.port, |
options.connection_attempts, |
options.connection_attempts, |
!options.rhosts_authentication && |
original_effective_uid != 0 || !options.use_privileged_port, |
!options.rhosts_rsa_authentication, |
pw, options.proxy_command); |
original_real_uid, |
|
options.proxy_command); |
|
|
|
/* |
/* |
* If we successfully made the connection, load the host private key |
* If we successfully made the connection, load the host private key |
|
|
* authentication. This must be done before releasing extra |
* authentication. This must be done before releasing extra |
* privileges, because the file is only readable by root. |
* privileges, because the file is only readable by root. |
*/ |
*/ |
if (ok && (options.protocol & SSH_PROTO_1)) { |
sensitive_data.nkeys = 0; |
Key k; |
sensitive_data.keys = NULL; |
host_private_key = RSA_new(); |
if (ok && (options.rhosts_rsa_authentication || |
k.type = KEY_RSA; |
options.hostbased_authentication)) { |
k.rsa = host_private_key; |
sensitive_data.nkeys = 3; |
if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) |
sensitive_data.keys = xmalloc(sensitive_data.nkeys*sizeof(Key)); |
host_private_key_loaded = 1; |
sensitive_data.keys[0] = key_load_private_type(KEY_RSA1, |
|
_PATH_HOST_KEY_FILE, "", NULL); |
|
sensitive_data.keys[1] = key_load_private_type(KEY_DSA, |
|
_PATH_HOST_DSA_KEY_FILE, "", NULL); |
|
sensitive_data.keys[2] = key_load_private_type(KEY_RSA, |
|
_PATH_HOST_RSA_KEY_FILE, "", NULL); |
} |
} |
/* |
/* |
* Get rid of any extra privileges that we may have. We will no |
* Get rid of any extra privileges that we may have. We will no |
|
|
* process, read the private hostkey and impersonate the host. |
* process, read the private hostkey and impersonate the host. |
* OpenBSD does not allow ptracing of setuid processes. |
* OpenBSD does not allow ptracing of setuid processes. |
*/ |
*/ |
permanently_set_uid(original_real_uid); |
permanently_set_uid(pw); |
|
|
/* |
/* |
* Now that we are back to our own permissions, create ~/.ssh |
* Now that we are back to our own permissions, create ~/.ssh |
* directory if it doesn\'t already exist. |
* directory if it doesn\'t already exist. |
*/ |
*/ |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
if (stat(buf, &st) < 0) |
if (stat(buf, &st) < 0) |
if (mkdir(buf, 0700) < 0) |
if (mkdir(buf, 0700) < 0) |
error("Could not create directory '%.200s'.", buf); |
error("Could not create directory '%.200s'.", buf); |
|
|
} |
} |
exit(1); |
exit(1); |
} |
} |
/* Expand ~ in options.identity_files. */ |
/* load options.identity_files */ |
/* XXX mem-leaks */ |
load_public_identity_files(); |
for (i = 0; i < options.num_identity_files; i++) |
|
options.identity_files[i] = |
|
tilde_expand_filename(options.identity_files[i], original_real_uid); |
|
for (i = 0; i < options.num_identity_files2; i++) |
|
options.identity_files2[i] = |
|
tilde_expand_filename(options.identity_files2[i], original_real_uid); |
|
/* Expand ~ in known host file names. */ |
/* Expand ~ in known host file names. */ |
options.system_hostfile = tilde_expand_filename(options.system_hostfile, |
/* XXX mem-leaks: */ |
original_real_uid); |
options.system_hostfile = |
options.user_hostfile = tilde_expand_filename(options.user_hostfile, |
tilde_expand_filename(options.system_hostfile, original_real_uid); |
original_real_uid); |
options.user_hostfile = |
options.system_hostfile2 = tilde_expand_filename(options.system_hostfile2, |
tilde_expand_filename(options.user_hostfile, original_real_uid); |
original_real_uid); |
options.system_hostfile2 = |
options.user_hostfile2 = tilde_expand_filename(options.user_hostfile2, |
tilde_expand_filename(options.system_hostfile2, original_real_uid); |
original_real_uid); |
options.user_hostfile2 = |
|
tilde_expand_filename(options.user_hostfile2, original_real_uid); |
|
|
/* Log into the remote system. This never returns if the login fails. */ |
/* Log into the remote system. This never returns if the login fails. */ |
ssh_login(host_private_key_loaded, host_private_key, |
ssh_login(sensitive_data.keys, sensitive_data.nkeys, |
host, (struct sockaddr *)&hostaddr, original_real_uid); |
host, (struct sockaddr *)&hostaddr, pw); |
|
|
/* We no longer need the host private key. Clear it now. */ |
/* We no longer need the private host keys. Clear them now. */ |
if (host_private_key_loaded) |
if (sensitive_data.nkeys != 0) { |
RSA_free(host_private_key); /* Destroys contents safely */ |
for (i = 0; i < sensitive_data.nkeys; i++) { |
|
if (sensitive_data.keys[i] != NULL) { |
|
/* Destroys contents safely */ |
|
debug3("clear hostkey %d", i); |
|
key_free(sensitive_data.keys[i]); |
|
sensitive_data.keys[i] = NULL; |
|
} |
|
} |
|
xfree(sensitive_data.keys); |
|
} |
|
|
exit_status = compat20 ? ssh_session2() : ssh_session(); |
exit_status = compat20 ? ssh_session2() : ssh_session(); |
packet_close(); |
packet_close(); |
|
|
|
|
if (options.xauth_location) { |
if (options.xauth_location) { |
/* Try to get Xauthority information for the display. */ |
/* Try to get Xauthority information for the display. */ |
snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", |
snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
options.xauth_location, getenv("DISPLAY")); |
options.xauth_location, getenv("DISPLAY")); |
f = popen(line, "r"); |
f = popen(line, "r"); |
if (f && fgets(line, sizeof(line), f) && |
if (f && fgets(line, sizeof(line), f) && |
|
|
} |
} |
} |
} |
|
|
|
void |
|
ssh_init_forwarding(void) |
|
{ |
|
int success = 0; |
|
int i; |
|
|
|
/* Initiate local TCP/IP port forwardings. */ |
|
for (i = 0; i < options.num_local_forwards; i++) { |
|
debug("Connections to local port %d forwarded to remote address %.200s:%d", |
|
options.local_forwards[i].port, |
|
options.local_forwards[i].host, |
|
options.local_forwards[i].host_port); |
|
success += channel_request_local_forwarding( |
|
options.local_forwards[i].port, |
|
options.local_forwards[i].host, |
|
options.local_forwards[i].host_port, |
|
options.gateway_ports); |
|
} |
|
if (i > 0 && success == 0) |
|
error("Could not request local forwarding."); |
|
|
|
/* Initiate remote TCP/IP port forwardings. */ |
|
for (i = 0; i < options.num_remote_forwards; i++) { |
|
debug("Connections to remote port %d forwarded to local address %.200s:%d", |
|
options.remote_forwards[i].port, |
|
options.remote_forwards[i].host, |
|
options.remote_forwards[i].host_port); |
|
channel_request_remote_forwarding( |
|
options.remote_forwards[i].port, |
|
options.remote_forwards[i].host, |
|
options.remote_forwards[i].host_port); |
|
} |
|
} |
|
|
|
void |
|
check_agent_present(void) |
|
{ |
|
if (options.forward_agent) { |
|
/* Clear agent forwarding if we don\'t have an agent. */ |
|
int authfd = ssh_get_authentication_socket(); |
|
if (authfd < 0) |
|
options.forward_agent = 0; |
|
else |
|
ssh_close_authentication_socket(authfd); |
|
} |
|
} |
|
|
int |
int |
ssh_session(void) |
ssh_session(void) |
{ |
{ |
int type; |
int type; |
int i; |
|
int plen; |
int plen; |
int interactive = 0; |
int interactive = 0; |
int have_tty = 0; |
int have_tty = 0; |
struct winsize ws; |
struct winsize ws; |
int authfd; |
|
char *cp; |
char *cp; |
|
|
/* Enable compression if requested. */ |
/* Enable compression if requested. */ |
|
|
packet_put_int(ws.ws_ypixel); |
packet_put_int(ws.ws_ypixel); |
|
|
/* Store tty modes in the packet. */ |
/* Store tty modes in the packet. */ |
tty_make_modes(fileno(stdin)); |
tty_make_modes(fileno(stdin), NULL); |
|
|
/* Send the packet, and wait for it to leave. */ |
/* Send the packet, and wait for it to leave. */ |
packet_send(); |
packet_send(); |
|
|
} |
} |
} |
} |
/* Tell the packet module whether this is an interactive session. */ |
/* Tell the packet module whether this is an interactive session. */ |
packet_set_interactive(interactive, options.keepalives); |
packet_set_interactive(interactive); |
|
|
/* Clear agent forwarding if we don\'t have an agent. */ |
|
authfd = ssh_get_authentication_socket(); |
|
if (authfd < 0) |
|
options.forward_agent = 0; |
|
else |
|
ssh_close_authentication_socket(authfd); |
|
|
|
/* Request authentication agent forwarding if appropriate. */ |
/* Request authentication agent forwarding if appropriate. */ |
|
check_agent_present(); |
|
|
if (options.forward_agent) { |
if (options.forward_agent) { |
debug("Requesting authentication agent forwarding."); |
debug("Requesting authentication agent forwarding."); |
auth_request_forwarding(); |
auth_request_forwarding(); |
|
|
if (type != SSH_SMSG_SUCCESS) |
if (type != SSH_SMSG_SUCCESS) |
log("Warning: Remote host denied authentication agent forwarding."); |
log("Warning: Remote host denied authentication agent forwarding."); |
} |
} |
/* Initiate local TCP/IP port forwardings. */ |
|
for (i = 0; i < options.num_local_forwards; i++) { |
|
debug("Connections to local port %d forwarded to remote address %.200s:%d", |
|
options.local_forwards[i].port, |
|
options.local_forwards[i].host, |
|
options.local_forwards[i].host_port); |
|
channel_request_local_forwarding(options.local_forwards[i].port, |
|
options.local_forwards[i].host, |
|
options.local_forwards[i].host_port, |
|
options.gateway_ports); |
|
} |
|
|
|
/* Initiate remote TCP/IP port forwardings. */ |
/* Initiate port forwardings. */ |
for (i = 0; i < options.num_remote_forwards; i++) { |
ssh_init_forwarding(); |
debug("Connections to remote port %d forwarded to local address %.200s:%d", |
|
options.remote_forwards[i].port, |
|
options.remote_forwards[i].host, |
|
options.remote_forwards[i].host_port); |
|
channel_request_remote_forwarding(options.remote_forwards[i].port, |
|
options.remote_forwards[i].host, |
|
options.remote_forwards[i].host_port); |
|
} |
|
|
|
/* If requested, let ssh continue in the background. */ |
/* If requested, let ssh continue in the background. */ |
if (fork_after_authentication_flag) |
if (fork_after_authentication_flag) |
|
|
} |
} |
|
|
void |
void |
init_local_fwd(void) |
client_subsystem_reply(int type, int plen, void *ctxt) |
{ |
{ |
int i; |
int id, len; |
/* Initiate local TCP/IP port forwardings. */ |
|
for (i = 0; i < options.num_local_forwards; i++) { |
id = packet_get_int(); |
debug("Connections to local port %d forwarded to remote address %.200s:%d", |
len = buffer_len(&command); |
options.local_forwards[i].port, |
if (len > 900) |
options.local_forwards[i].host, |
len = 900; |
options.local_forwards[i].host_port); |
packet_done(); |
channel_request_local_forwarding(options.local_forwards[i].port, |
if (type == SSH2_MSG_CHANNEL_FAILURE) |
options.local_forwards[i].host, |
fatal("Request for subsystem '%.*s' failed on channel %d", |
options.local_forwards[i].host_port, |
len, buffer_ptr(&command), id); |
options.gateway_ports); |
|
} |
|
} |
} |
|
|
extern void client_set_session_ident(int id); |
|
|
|
void |
void |
client_init(int id, void *arg) |
ssh_session2_callback(int id, void *arg) |
{ |
{ |
int len; |
int len; |
debug("client_init id %d arg %d", id, (int)arg); |
int interactive = 0; |
|
struct termios tio; |
|
|
if (no_shell_flag) |
debug("client_init id %d arg %ld", id, (long)arg); |
goto done; |
|
|
|
if (tty_flag) { |
if (tty_flag) { |
struct winsize ws; |
struct winsize ws; |
|
|
packet_put_int(ws.ws_row); |
packet_put_int(ws.ws_row); |
packet_put_int(ws.ws_xpixel); |
packet_put_int(ws.ws_xpixel); |
packet_put_int(ws.ws_ypixel); |
packet_put_int(ws.ws_ypixel); |
packet_put_cstring(""); /* XXX: encode terminal modes */ |
tio = get_saved_tio(); |
|
tty_make_modes(/*ignored*/ 0, &tio); |
packet_send(); |
packet_send(); |
|
interactive = 1; |
/* XXX wait for reply */ |
/* XXX wait for reply */ |
} |
} |
if (options.forward_x11 && |
if (options.forward_x11 && |
|
|
/* Request forwarding with authentication spoofing. */ |
/* Request forwarding with authentication spoofing. */ |
debug("Requesting X11 forwarding with authentication spoofing."); |
debug("Requesting X11 forwarding with authentication spoofing."); |
x11_request_forwarding_with_spoofing(id, proto, data); |
x11_request_forwarding_with_spoofing(id, proto, data); |
|
interactive = 1; |
/* XXX wait for reply */ |
/* XXX wait for reply */ |
} |
} |
|
|
|
check_agent_present(); |
|
if (options.forward_agent) { |
|
debug("Requesting authentication agent forwarding."); |
|
channel_request_start(id, "auth-agent-req@openssh.com", 0); |
|
packet_send(); |
|
} |
|
|
len = buffer_len(&command); |
len = buffer_len(&command); |
if (len > 0) { |
if (len > 0) { |
if (len > 900) |
if (len > 900) |
len = 900; |
len = 900; |
debug("Sending command: %.*s", len, buffer_ptr(&command)); |
if (subsystem_flag) { |
channel_request_start(id, "exec", 0); |
debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); |
packet_put_string(buffer_ptr(&command), len); |
channel_request_start(id, "subsystem", /*want reply*/ 1); |
|
/* register callback for reply */ |
|
/* XXX we asume that client_loop has already been called */ |
|
dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply); |
|
dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply); |
|
} else { |
|
debug("Sending command: %.*s", len, buffer_ptr(&command)); |
|
channel_request_start(id, "exec", 0); |
|
} |
|
packet_put_string(buffer_ptr(&command), buffer_len(&command)); |
packet_send(); |
packet_send(); |
} else { |
} else { |
channel_request(id, "shell", 0); |
channel_request(id, "shell", 0); |
} |
} |
/* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ |
/* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ |
done: |
|
/* register different callback, etc. XXX */ |
/* register different callback, etc. XXX */ |
client_set_session_ident(id); |
packet_set_interactive(interactive); |
} |
} |
|
|
int |
int |
ssh_session2(void) |
ssh_session2_command(void) |
{ |
{ |
int window, packetmax, id; |
int id, window, packetmax; |
int in, out, err; |
int in, out, err; |
|
|
if (stdin_null_flag) { |
if (stdin_null_flag) { |
in = open("/dev/null", O_RDONLY); |
in = open(_PATH_DEVNULL, O_RDONLY); |
} else { |
} else { |
in = dup(STDIN_FILENO); |
in = dup(STDIN_FILENO); |
} |
} |
|
|
if (!isatty(err)) |
if (!isatty(err)) |
set_nonblock(err); |
set_nonblock(err); |
|
|
/* should be pre-session */ |
|
init_local_fwd(); |
|
|
|
/* If requested, let ssh continue in the background. */ |
|
if (fork_after_authentication_flag) |
|
if (daemon(1, 1) < 0) |
|
fatal("daemon() failed: %.200s", strerror(errno)); |
|
|
|
window = CHAN_SES_WINDOW_DEFAULT; |
window = CHAN_SES_WINDOW_DEFAULT; |
packetmax = CHAN_SES_PACKET_DEFAULT; |
packetmax = CHAN_SES_PACKET_DEFAULT; |
if (!tty_flag) { |
if (!tty_flag) { |
|
|
window, packetmax, CHAN_EXTENDED_WRITE, |
window, packetmax, CHAN_EXTENDED_WRITE, |
xstrdup("client-session"), /*nonblock*/0); |
xstrdup("client-session"), /*nonblock*/0); |
|
|
|
debug("channel_new: %d", id); |
|
|
channel_open(id); |
channel_open(id); |
channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, client_init, (void *)0); |
channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
|
ssh_session2_callback, (void *)0); |
|
|
|
return id; |
|
} |
|
|
|
int |
|
ssh_session2(void) |
|
{ |
|
int id; |
|
|
|
/* XXX should be pre-session */ |
|
ssh_init_forwarding(); |
|
|
|
id = no_shell_flag ? -1 : ssh_session2_command(); |
|
|
|
/* If requested, let ssh continue in the background. */ |
|
if (fork_after_authentication_flag) |
|
if (daemon(1, 1) < 0) |
|
fatal("daemon() failed: %.200s", strerror(errno)); |
|
|
return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
|
} |
|
|
|
void |
|
load_public_identity_files(void) |
|
{ |
|
char *filename; |
|
Key *public; |
|
int i; |
|
|
|
for (i = 0; i < options.num_identity_files; i++) { |
|
filename = tilde_expand_filename(options.identity_files[i], |
|
original_real_uid); |
|
public = key_load_public(filename, NULL); |
|
debug("identity file %s type %d", filename, |
|
public ? public->type : -1); |
|
xfree(options.identity_files[i]); |
|
options.identity_files[i] = filename; |
|
options.identity_keys[i] = public; |
|
} |
} |
} |