version 1.47.2.2, 2004/03/04 18:18:15 |
version 1.48, 2003/04/08 20:21:28 |
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case SSH_CMSG_AUTH_TIS: |
case SSH_CMSG_AUTH_TIS: |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
case SSH_CMSG_AUTH_TIS_RESPONSE: |
return "challenge-response"; |
return "challenge-response"; |
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#if defined(KRB4) || defined(KRB5) |
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case SSH_CMSG_AUTH_KERBEROS: |
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return "kerberos"; |
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#endif |
} |
} |
snprintf(buf, sizeof buf, "bad-auth-msg-%d", type); |
snprintf(buf, sizeof buf, "bad-auth-msg-%d", type); |
return buf; |
return buf; |
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u_int dlen; |
u_int dlen; |
u_int ulen; |
u_int ulen; |
int type = 0; |
int type = 0; |
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struct passwd *pw = authctxt->pw; |
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debug("Attempting authentication for %s%.100s.", |
debug("Attempting authentication for %s%.100s.", |
authctxt->valid ? "" : "illegal user ", authctxt->user); |
authctxt->valid ? "" : "illegal user ", authctxt->user); |
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/* If the user has no password, accept authentication immediately. */ |
/* If the user has no password, accept authentication immediately. */ |
if (options.password_authentication && |
if (options.password_authentication && |
#ifdef KRB5 |
#if defined(KRB4) || defined(KRB5) |
(!options.kerberos_authentication || options.kerberos_or_local_passwd) && |
(!options.kerberos_authentication || options.kerberos_or_local_passwd) && |
#endif |
#endif |
PRIVSEP(auth_password(authctxt, ""))) { |
PRIVSEP(auth_password(authctxt, ""))) { |
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/* Process the packet. */ |
/* Process the packet. */ |
switch (type) { |
switch (type) { |
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#if defined(KRB4) || defined(KRB5) |
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case SSH_CMSG_AUTH_KERBEROS: |
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if (!options.kerberos_authentication) { |
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verbose("Kerberos authentication disabled."); |
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} else { |
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char *kdata = packet_get_string(&dlen); |
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packet_check_eom(); |
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if (kdata[0] == 4) { /* KRB_PROT_VERSION */ |
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#ifdef KRB4 |
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KTEXT_ST tkt, reply; |
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tkt.length = dlen; |
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if (tkt.length < MAX_KTXT_LEN) |
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memcpy(tkt.dat, kdata, tkt.length); |
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if (PRIVSEP(auth_krb4(authctxt, &tkt, |
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&client_user, &reply))) { |
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authenticated = 1; |
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snprintf(info, sizeof(info), |
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" tktuser %.100s", |
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client_user); |
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packet_start( |
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SSH_SMSG_AUTH_KERBEROS_RESPONSE); |
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packet_put_string((char *) |
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reply.dat, reply.length); |
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packet_send(); |
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packet_write_wait(); |
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xfree(client_user); |
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} |
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#endif /* KRB4 */ |
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} else { |
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#ifdef KRB5 |
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krb5_data tkt, reply; |
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tkt.length = dlen; |
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tkt.data = kdata; |
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if (PRIVSEP(auth_krb5(authctxt, &tkt, |
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&client_user, &reply))) { |
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authenticated = 1; |
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snprintf(info, sizeof(info), |
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" tktuser %.100s", |
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client_user); |
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/* Send response to client */ |
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packet_start( |
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SSH_SMSG_AUTH_KERBEROS_RESPONSE); |
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packet_put_string((char *) |
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reply.data, reply.length); |
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packet_send(); |
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packet_write_wait(); |
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if (reply.length) |
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xfree(reply.data); |
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xfree(client_user); |
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} |
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#endif /* KRB5 */ |
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} |
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xfree(kdata); |
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} |
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break; |
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#endif /* KRB4 || KRB5 */ |
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#if defined(AFS) || defined(KRB5) |
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/* XXX - punt on backward compatibility here. */ |
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case SSH_CMSG_HAVE_KERBEROS_TGT: |
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packet_send_debug("Kerberos TGT passing disabled before authentication."); |
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break; |
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#ifdef AFS |
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case SSH_CMSG_HAVE_AFS_TOKEN: |
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packet_send_debug("AFS token passing disabled before authentication."); |
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break; |
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#endif /* AFS */ |
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#endif /* AFS || KRB5 */ |
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case SSH_CMSG_AUTH_RHOSTS: |
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if (!options.rhosts_authentication) { |
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verbose("Rhosts authentication disabled."); |
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break; |
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} |
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/* |
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* Get client user name. Note that we just have to |
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* trust the client; this is one reason why rhosts |
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* authentication is insecure. (Another is |
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* IP-spoofing on a local network.) |
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*/ |
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client_user = packet_get_string(&ulen); |
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packet_check_eom(); |
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/* Try to authenticate using /etc/hosts.equiv and .rhosts. */ |
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authenticated = auth_rhosts(pw, client_user); |
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snprintf(info, sizeof info, " ruser %.100s", client_user); |
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xfree(client_user); |
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break; |
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case SSH_CMSG_AUTH_RHOSTS_RSA: |
case SSH_CMSG_AUTH_RHOSTS_RSA: |
if (!options.rhosts_rsa_authentication) { |
if (!options.rhosts_rsa_authentication) { |
verbose("Rhosts with RSA authentication disabled."); |
verbose("Rhosts with RSA authentication disabled."); |
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BN_num_bits(client_host_key->rsa->n), bits); |
BN_num_bits(client_host_key->rsa->n), bits); |
packet_check_eom(); |
packet_check_eom(); |
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authenticated = auth_rhosts_rsa(authctxt, client_user, |
authenticated = auth_rhosts_rsa(pw, client_user, |
client_host_key); |
client_host_key); |
key_free(client_host_key); |
key_free(client_host_key); |
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fatal("do_authloop: BN_new failed"); |
fatal("do_authloop: BN_new failed"); |
packet_get_bignum(n); |
packet_get_bignum(n); |
packet_check_eom(); |
packet_check_eom(); |
authenticated = auth_rsa(authctxt, n); |
authenticated = auth_rsa(pw, n); |
BN_clear_free(n); |
BN_clear_free(n); |
break; |
break; |
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* Performs authentication of an incoming connection. Session key has already |
* Performs authentication of an incoming connection. Session key has already |
* been exchanged and encryption is enabled. |
* been exchanged and encryption is enabled. |
*/ |
*/ |
void |
Authctxt * |
do_authentication(Authctxt *authctxt) |
do_authentication(void) |
{ |
{ |
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Authctxt *authctxt; |
u_int ulen; |
u_int ulen; |
char *user, *style = NULL; |
char *user, *style = NULL; |
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if ((style = strchr(user, ':')) != NULL) |
if ((style = strchr(user, ':')) != NULL) |
*style++ = '\0'; |
*style++ = '\0'; |
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#ifdef KRB5 |
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/* XXX - SSH.com Kerberos v5 braindeath. */ |
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if ((datafellows & SSH_BUG_K5USER) && |
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options.kerberos_authentication) { |
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char *p; |
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if ((p = strchr(user, '@')) != NULL) |
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*p = '\0'; |
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} |
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#endif |
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authctxt = authctxt_new(); |
authctxt->user = user; |
authctxt->user = user; |
authctxt->style = style; |
authctxt->style = style; |
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/* Verify that the user is a valid user. */ |
/* Verify that the user is a valid user. */ |
if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL) |
if ((authctxt->pw = PRIVSEP(getpwnamallow(user))) != NULL) |
authctxt->valid = 1; |
authctxt->valid = 1; |
else { |
else |
debug("do_authentication: illegal user %s", user); |
debug("do_authentication: illegal user %s", user); |
authctxt->pw = fakepw(); |
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} |
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setproctitle("%s%s", authctxt->pw ? user : "unknown", |
setproctitle("%s%s", authctxt->pw ? user : "unknown", |
use_privsep ? " [net]" : ""); |
use_privsep ? " [net]" : ""); |
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packet_start(SSH_SMSG_SUCCESS); |
packet_start(SSH_SMSG_SUCCESS); |
packet_send(); |
packet_send(); |
packet_write_wait(); |
packet_write_wait(); |
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return (authctxt); |
} |
} |