*/
#include "includes.h"
-RCSID("$OpenBSD: sshconnect1.c,v 1.42 2001/12/19 07:18:56 deraadt Exp $");
+RCSID("$OpenBSD: sshconnect1.c,v 1.49 2002/03/14 15:24:27 markus Exp $");
#include <openssl/bn.h>
-#include <openssl/evp.h>
+#include <openssl/md5.h>
#ifdef KRB4
#include <krb.h>
AuthenticationConnection *auth;
u_char response[16];
u_int i;
- int plen, clen;
Key *key;
BIGNUM *challenge;
if (!auth)
return 0;
- challenge = BN_new();
-
+ if ((challenge = BN_new()) == NULL)
+ fatal("try_agent_authentication: BN_new failed");
/* Loop through identities served by the agent. */
for (key = ssh_get_first_identity(auth, &comment, 1);
key != NULL;
packet_write_wait();
/* Wait for server's response. */
- type = packet_read(&plen);
+ type = packet_read();
/* The server sends failure if it doesn\'t like our key or
does not support RSA authentication. */
packet_disconnect("Protocol error during RSA authentication: %d",
type);
- packet_get_bignum(challenge, &clen);
-
- packet_integrity_check(plen, clen, type);
+ packet_get_bignum(challenge);
+ packet_check_eom();
debug("Received RSA challenge from server.");
packet_write_wait();
/* Wait for response from the server. */
- type = packet_read(&plen);
+ type = packet_read();
/* The server returns success if it accepted the authentication. */
if (type == SSH_SMSG_SUCCESS) {
BIGNUM *challenge;
Key *public, *private;
char buf[300], *passphrase, *comment, *authfile;
- int i, type, quit, plen, clen;
+ int i, type, quit;
public = options.identity_keys[idx];
authfile = options.identity_files[idx];
packet_write_wait();
/* Wait for server's response. */
- type = packet_read(&plen);
+ type = packet_read();
/*
* The server responds with failure if it doesn\'t like our key or
packet_disconnect("Protocol error during RSA authentication: %d", type);
/* Get the challenge from the packet. */
- challenge = BN_new();
- packet_get_bignum(challenge, &clen);
-
- packet_integrity_check(plen, clen, type);
+ if ((challenge = BN_new()) == NULL)
+ fatal("try_rsa_authentication: BN_new failed");
+ packet_get_bignum(challenge);
+ packet_check_eom();
debug("Received RSA challenge from server.");
packet_write_wait();
/* Expect the server to reject it... */
- packet_read_expect(&plen, SSH_SMSG_FAILURE);
+ packet_read_expect(SSH_SMSG_FAILURE);
BN_clear_free(challenge);
return 0;
}
BN_clear_free(challenge);
/* Wait for response from the server. */
- type = packet_read(&plen);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS) {
debug("RSA authentication accepted by server.");
return 1;
{
int type;
BIGNUM *challenge;
- int plen, clen;
debug("Trying rhosts or /etc/hosts.equiv with RSA host authentication.");
packet_write_wait();
/* Wait for server's response. */
- type = packet_read(&plen);
+ type = packet_read();
/* The server responds with failure if it doesn't admit our
.rhosts authentication or doesn't know our host key. */
packet_disconnect("Protocol error during RSA authentication: %d", type);
/* Get the challenge from the packet. */
- challenge = BN_new();
- packet_get_bignum(challenge, &clen);
-
- packet_integrity_check(plen, clen, type);
+ if ((challenge = BN_new()) == NULL)
+ fatal("try_rhosts_rsa_authentication: BN_new failed");
+ packet_get_bignum(challenge);
+ packet_check_eom();
debug("Received RSA challenge for host key from server.");
BN_clear_free(challenge);
/* Wait for response from the server. */
- type = packet_read(&plen);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS) {
debug("Rhosts or /etc/hosts.equiv with RSA host authentication accepted by server.");
return 1;
char inst[INST_SZ];
char *realm;
CREDENTIALS cred;
- int r, type, plen;
+ int r, type;
socklen_t slen;
Key_schedule schedule;
u_long checksum, cksum;
fatal_cleanup();
}
/* Get server reply. */
- type = packet_read(&plen);
+ type = packet_read();
switch (type) {
case SSH_SMSG_FAILURE:
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
/* Get server's response. */
reply = packet_get_string((u_int *) &auth.length);
+ if (auth.length >= MAX_KTXT_LEN)
+ fatal("Kerberos v4: Malformed response from server");
memcpy(auth.dat, reply, auth.length);
xfree(reply);
- packet_integrity_check(plen, 4 + auth.length, type);
+ packet_check_eom();
/*
* If his response isn't properly encrypted with the session
krb5_ccache ccache = NULL;
const char *remotehost;
krb5_data ap;
- int type, payload_len;
+ int type;
krb5_ap_rep_enc_part *reply = NULL;
int ret;
xfree(ap.data);
ap.length = 0;
- type = packet_read(&payload_len);
+ type = packet_read();
switch (type) {
case SSH_SMSG_FAILURE:
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
/* Get server's response. */
ap.data = packet_get_string((unsigned int *) &ap.length);
-
- packet_integrity_check(payload_len, 4 + ap.length, type);
+ packet_check_eom();
/* XXX je to dobre? */
problem = krb5_rd_rep(*context, *auth_context, &ap, &reply);
static void
send_krb5_tgt(krb5_context context, krb5_auth_context auth_context)
{
- int fd, type, payload_len;
+ int fd, type;
krb5_error_code problem;
krb5_data outbuf;
krb5_ccache ccache = NULL;
packet_send();
packet_write_wait();
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS) {
char *pname;
CREDENTIALS *creds;
struct stat st;
char buffer[4096], pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
- int problem, type, len;
+ int problem, type;
/* Don't do anything if we don't have any tickets. */
if (stat(tkt_string(), &st) < 0)
packet_send();
packet_write_wait();
- type = packet_read(&len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
debug("Kerberos v4 TGT forwarded (%s%s%s@%s).",
/* Roger, Roger. Clearance, Clarence. What's your vector,
Victor? */
- type = packet_read(&len);
+ type = packet_read();
if (type == SSH_SMSG_FAILURE)
debug("AFS token for cell %s rejected.", server_cell);
try_challenge_response_authentication(void)
{
int type, i;
- int payload_len;
u_int clen;
char prompt[1024];
char *challenge, *response;
packet_send();
packet_write_wait();
- type = packet_read(&payload_len);
+ type = packet_read();
if (type != SSH_SMSG_FAILURE &&
type != SSH_SMSG_AUTH_TIS_CHALLENGE) {
packet_disconnect("Protocol error: got %d in response "
return 0;
}
challenge = packet_get_string(&clen);
- packet_integrity_check(payload_len, (4 + clen), type);
+ packet_check_eom();
snprintf(prompt, sizeof prompt, "%s%s", challenge,
strchr(challenge, '\n') ? "" : "\nResponse: ");
xfree(challenge);
xfree(response);
packet_send();
packet_write_wait();
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
return 1;
if (type != SSH_SMSG_FAILURE)
static int
try_password_authentication(char *prompt)
{
- int type, i, payload_len;
+ int type, i;
char *password;
debug("Doing password authentication.");
packet_send();
packet_write_wait();
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
return 1;
if (type != SSH_SMSG_FAILURE)
{
int i;
BIGNUM *key;
- RSA *host_key;
- RSA *public_key;
- Key k;
+ Key *host_key, *server_key;
int bits, rbits;
int ssh_cipher_default = SSH_CIPHER_3DES;
u_char session_key[SSH_SESSION_KEY_LENGTH];
u_char cookie[8];
u_int supported_ciphers;
u_int server_flags, client_flags;
- int payload_len, clen, sum_len = 0;
u_int32_t rand = 0;
debug("Waiting for server public key.");
/* Wait for a public key packet from the server. */
- packet_read_expect(&payload_len, SSH_SMSG_PUBLIC_KEY);
+ packet_read_expect(SSH_SMSG_PUBLIC_KEY);
/* Get cookie from the packet. */
for (i = 0; i < 8; i++)
cookie[i] = packet_get_char();
/* Get the public key. */
- public_key = RSA_new();
- bits = packet_get_int();/* bits */
- public_key->e = BN_new();
- packet_get_bignum(public_key->e, &clen);
- sum_len += clen;
- public_key->n = BN_new();
- packet_get_bignum(public_key->n, &clen);
- sum_len += clen;
-
- rbits = BN_num_bits(public_key->n);
+ server_key = key_new(KEY_RSA1);
+ bits = packet_get_int();
+ packet_get_bignum(server_key->rsa->e);
+ packet_get_bignum(server_key->rsa->n);
+
+ rbits = BN_num_bits(server_key->rsa->n);
if (bits != rbits) {
log("Warning: Server lies about size of server public key: "
"actual size is %d bits vs. announced %d.", rbits, bits);
log("Warning: This may be due to an old implementation of ssh.");
}
/* Get the host key. */
- host_key = RSA_new();
- bits = packet_get_int();/* bits */
- host_key->e = BN_new();
- packet_get_bignum(host_key->e, &clen);
- sum_len += clen;
- host_key->n = BN_new();
- packet_get_bignum(host_key->n, &clen);
- sum_len += clen;
-
- rbits = BN_num_bits(host_key->n);
+ host_key = key_new(KEY_RSA1);
+ bits = packet_get_int();
+ packet_get_bignum(host_key->rsa->e);
+ packet_get_bignum(host_key->rsa->n);
+
+ rbits = BN_num_bits(host_key->rsa->n);
if (bits != rbits) {
log("Warning: Server lies about size of server host key: "
"actual size is %d bits vs. announced %d.", rbits, bits);
supported_ciphers = packet_get_int();
supported_authentications = packet_get_int();
+ packet_check_eom();
debug("Received server public key (%d bits) and host key (%d bits).",
- BN_num_bits(public_key->n), BN_num_bits(host_key->n));
-
- packet_integrity_check(payload_len,
- 8 + 4 + sum_len + 0 + 4 + 0 + 0 + 4 + 4 + 4,
- SSH_SMSG_PUBLIC_KEY);
- k.type = KEY_RSA1;
- k.rsa = host_key;
- if (verify_host_key(host, hostaddr, &k) == -1)
+ BN_num_bits(server_key->rsa->n), BN_num_bits(host_key->rsa->n));
+
+ if (verify_host_key(host, hostaddr, host_key) == -1)
fatal("Host key verification failed.");
client_flags = SSH_PROTOFLAG_SCREEN_NUMBER | SSH_PROTOFLAG_HOST_IN_FWD_OPEN;
- compute_session_id(session_id, cookie, host_key->n, public_key->n);
+ compute_session_id(session_id, cookie, host_key->rsa->n, server_key->rsa->n);
/* Generate a session key. */
arc4random_stir();
* is the highest byte of the integer. The session key is xored with
* the first 16 bytes of the session id.
*/
- key = BN_new();
+ if ((key = BN_new()) == NULL)
+ fatal("respond_to_rsa_challenge: BN_new failed");
BN_set_word(key, 0);
for (i = 0; i < SSH_SESSION_KEY_LENGTH; i++) {
BN_lshift(key, key, 8);
* Encrypt the integer using the public key and host key of the
* server (key with smaller modulus first).
*/
- if (BN_cmp(public_key->n, host_key->n) < 0) {
+ if (BN_cmp(server_key->rsa->n, host_key->rsa->n) < 0) {
/* Public key has smaller modulus. */
- if (BN_num_bits(host_key->n) <
- BN_num_bits(public_key->n) + SSH_KEY_BITS_RESERVED) {
- fatal("respond_to_rsa_challenge: host_key %d < public_key %d + "
+ if (BN_num_bits(host_key->rsa->n) <
+ BN_num_bits(server_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
+ fatal("respond_to_rsa_challenge: host_key %d < server_key %d + "
"SSH_KEY_BITS_RESERVED %d",
- BN_num_bits(host_key->n),
- BN_num_bits(public_key->n),
+ BN_num_bits(host_key->rsa->n),
+ BN_num_bits(server_key->rsa->n),
SSH_KEY_BITS_RESERVED);
}
- rsa_public_encrypt(key, key, public_key);
- rsa_public_encrypt(key, key, host_key);
+ rsa_public_encrypt(key, key, server_key->rsa);
+ rsa_public_encrypt(key, key, host_key->rsa);
} else {
/* Host key has smaller modulus (or they are equal). */
- if (BN_num_bits(public_key->n) <
- BN_num_bits(host_key->n) + SSH_KEY_BITS_RESERVED) {
- fatal("respond_to_rsa_challenge: public_key %d < host_key %d + "
+ if (BN_num_bits(server_key->rsa->n) <
+ BN_num_bits(host_key->rsa->n) + SSH_KEY_BITS_RESERVED) {
+ fatal("respond_to_rsa_challenge: server_key %d < host_key %d + "
"SSH_KEY_BITS_RESERVED %d",
- BN_num_bits(public_key->n),
- BN_num_bits(host_key->n),
+ BN_num_bits(server_key->rsa->n),
+ BN_num_bits(host_key->rsa->n),
SSH_KEY_BITS_RESERVED);
}
- rsa_public_encrypt(key, key, host_key);
- rsa_public_encrypt(key, key, public_key);
+ rsa_public_encrypt(key, key, host_key->rsa);
+ rsa_public_encrypt(key, key, server_key->rsa);
}
/* Destroy the public keys since we no longer need them. */
- RSA_free(public_key);
- RSA_free(host_key);
+ key_free(server_key);
+ key_free(host_key);
if (options.cipher == SSH_CIPHER_NOT_SET) {
if (cipher_mask_ssh1(1) & supported_ciphers & (1 << ssh_cipher_default))
* Expect a success message from the server. Note that this message
* will be received in encrypted form.
*/
- packet_read_expect(&payload_len, SSH_SMSG_SUCCESS);
+ packet_read_expect(SSH_SMSG_SUCCESS);
debug("Received encrypted confirmation.");
}
krb5_auth_context auth_context = NULL;
#endif
int i, type;
- int payload_len;
if (supported_authentications == 0)
fatal("ssh_userauth1: server supports no auth methods");
* needed (the user has no password). Otherwise the server responds
* with failure.
*/
- type = packet_read(&payload_len);
+ type = packet_read();
/* check whether the connection was accepted without authentication. */
if (type == SSH_SMSG_SUCCESS)
debug("Trying Kerberos v5 authentication.");
if (try_krb5_authentication(&context, &auth_context)) {
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
goto success;
if (type != SSH_SMSG_FAILURE)
debug("Trying Kerberos v4 authentication.");
if (try_krb4_authentication()) {
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
goto success;
if (type != SSH_SMSG_FAILURE)
packet_write_wait();
/* The server should respond with success or failure. */
- type = packet_read(&payload_len);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
goto success;
if (type != SSH_SMSG_FAILURE)
andersk / openssh.git / blobdiff