*/
#include "includes.h"
-RCSID("$OpenBSD: auth1.c,v 1.14 2001/01/22 23:06:39 markus Exp $");
-
-#ifdef HAVE_OSF_SIA
-# include <sia.h>
-# include <siad.h>
-#endif
+RCSID("$OpenBSD: auth1.c,v 1.25 2001/06/26 16:15:23 dugsong Exp $");
#include "xmalloc.h"
#include "rsa.h"
#include "compat.h"
#include "auth.h"
#include "session.h"
+#include "misc.h"
+#include "uidswap.h"
/* import */
extern ServerOptions options;
-extern char *forced_command;
#ifdef WITH_AIXAUTHENTICATE
extern char *aixloginmsg;
#endif /* WITH_AIXAUTHENTICATE */
-#ifdef HAVE_OSF_SIA
-extern int saved_argc;
-extern char **saved_argv;
-#endif /* HAVE_OSF_SIA */
/*
* convert ssh auth msg type into description
*/
-char *
+static char *
get_authname(int type)
{
static char buf[1024];
case SSH_CMSG_AUTH_TIS:
case SSH_CMSG_AUTH_TIS_RESPONSE:
return "challenge-response";
-#ifdef KRB4
+#if defined(KRB4) || defined(KRB5)
case SSH_CMSG_AUTH_KERBEROS:
return "kerberos";
#endif
* read packets, try to authenticate the user and
* return only if authentication is successful
*/
-void
+static void
do_authloop(Authctxt *authctxt)
{
int authenticated = 0;
/* If the user has no password, accept authentication immediately. */
if (options.password_authentication &&
-#ifdef KRB4
+#if defined(KRB4) || defined(KRB5)
(!options.kerberos_authentication || options.kerberos_or_local_passwd) &&
#endif
#ifdef USE_PAM
- auth_pam_password(pw, password)) {
+ auth_pam_password(pw, "")) {
+#elif defined(HAVE_OSF_SIA)
+ 0) {
#else
- auth_password(pw, "")) {
+ auth_password(authctxt, "")) {
#endif
auth_log(authctxt, 1, "without authentication", "");
return;
/* Process the packet. */
switch (type) {
-#ifdef AFS
- case SSH_CMSG_HAVE_KERBEROS_TGT:
- if (!options.kerberos_tgt_passing) {
- verbose("Kerberos tgt passing disabled.");
- break;
- } else {
- /* Accept Kerberos tgt. */
- char *tgt = packet_get_string(&dlen);
- packet_integrity_check(plen, 4 + dlen, type);
- if (!auth_kerberos_tgt(pw, tgt))
- verbose("Kerberos tgt REFUSED for %.100s", authctxt->user);
- xfree(tgt);
- }
- continue;
- case SSH_CMSG_HAVE_AFS_TOKEN:
- if (!options.afs_token_passing || !k_hasafs()) {
- verbose("AFS token passing disabled.");
- break;
- } else {
- /* Accept AFS token. */
- char *token_string = packet_get_string(&dlen);
- packet_integrity_check(plen, 4 + dlen, type);
- if (!auth_afs_token(pw, token_string))
- verbose("AFS token REFUSED for %.100s", authctxt->user);
- xfree(token_string);
- }
- continue;
-#endif /* AFS */
-#ifdef KRB4
+#if defined(KRB4) || defined(KRB5)
case SSH_CMSG_AUTH_KERBEROS:
if (!options.kerberos_authentication) {
verbose("Kerberos authentication disabled.");
- break;
} else {
- /* Try Kerberos v4 authentication. */
- KTEXT_ST auth;
- char *tkt_user = NULL;
- char *kdata = packet_get_string((u_int *) &auth.length);
- packet_integrity_check(plen, 4 + auth.length, type);
-
- if (authctxt->valid) {
- if (auth.length < MAX_KTXT_LEN)
- memcpy(auth.dat, kdata, auth.length);
- authenticated = auth_krb4(pw->pw_name, &auth, &tkt_user);
- if (authenticated) {
- snprintf(info, sizeof info,
- " tktuser %.100s", tkt_user);
- xfree(tkt_user);
+ char *kdata = packet_get_string(&dlen);
+
+ packet_integrity_check(plen, 4 + dlen, type);
+
+ if (kdata[0] == 4) { /* KRB_PROT_VERSION */
+#ifdef KRB4
+ KTEXT_ST tkt;
+
+ tkt.length = dlen;
+ if (tkt.length < MAX_KTXT_LEN)
+ memcpy(tkt.dat, kdata, tkt.length);
+
+ if (auth_krb4(authctxt, &tkt, &client_user)) {
+ authenticated = 1;
+ snprintf(info, sizeof(info),
+ " tktuser %.100s",
+ client_user);
+ xfree(client_user);
}
+#endif /* KRB4 */
+ } else {
+#ifdef KRB5
+ krb5_data tkt;
+ tkt.length = dlen;
+ tkt.data = kdata;
+
+ if (auth_krb5(authctxt, &tkt, &client_user)) {
+ authenticated = 1;
+ snprintf(info, sizeof(info),
+ " tktuser %.100s",
+ client_user);
+ xfree(client_user);
+ }
+#endif /* KRB5 */
}
xfree(kdata);
}
break;
-#endif /* KRB4 */
-
+#endif /* KRB4 || KRB5 */
+
+#if defined(AFS) || defined(KRB5)
+ /* XXX - punt on backward compatibility here. */
+ case SSH_CMSG_HAVE_KERBEROS_TGT:
+ packet_send_debug("Kerberos TGT passing disabled before authentication.");
+ break;
+#ifdef AFS
+ case SSH_CMSG_HAVE_AFS_TOKEN:
+ packet_send_debug("AFS token passing disabled before authentication.");
+ break;
+#endif /* AFS */
+#endif /* AFS || KRB5 */
+
case SSH_CMSG_AUTH_RHOSTS:
if (!options.rhosts_authentication) {
verbose("Rhosts authentication disabled.");
authenticated = auth_pam_password(pw, password);
#elif defined(HAVE_OSF_SIA)
/* Do SIA auth with password */
- if (sia_validate_user(NULL, saved_argc, saved_argv,
- get_canonical_hostname(options.reverse_mapping_check),
- pw->pw_name, NULL, 0, NULL, password) == SIASUCCESS) {
- authenticated = 1;
- }
+ authenticated = auth_sia_password(authctxt->user,
+ password);
#else /* !USE_PAM && !HAVE_OSF_SIA */
/* Try authentication with the password. */
- authenticated = auth_password(pw, password);
+ authenticated = auth_password(authctxt, password);
#endif /* USE_PAM */
memset(password, 0, strlen(password));
case SSH_CMSG_AUTH_TIS:
debug("rcvd SSH_CMSG_AUTH_TIS");
- if (options.challenge_reponse_authentication == 1) {
- char *challenge = get_challenge(authctxt, authctxt->style);
+ if (options.challenge_response_authentication == 1) {
+ char *challenge = get_challenge(authctxt);
if (challenge != NULL) {
debug("sending challenge '%s'", challenge);
packet_start(SSH_SMSG_AUTH_TIS_CHALLENGE);
packet_put_cstring(challenge);
+ xfree(challenge);
packet_send();
packet_write_wait();
continue;
break;
case SSH_CMSG_AUTH_TIS_RESPONSE:
debug("rcvd SSH_CMSG_AUTH_TIS_RESPONSE");
- if (options.challenge_reponse_authentication == 1) {
+ if (options.challenge_response_authentication == 1) {
char *response = packet_get_string(&dlen);
debug("got response '%s'", response);
packet_integrity_check(plen, 4 + dlen, type);
log("Unknown message during authentication: type %d", type);
break;
}
+#ifdef BSD_AUTH
+ if (authctxt->as) {
+ auth_close(authctxt->as);
+ authctxt->as = NULL;
+ }
+#endif
if (!authctxt->valid && authenticated)
fatal("INTERNAL ERROR: authenticated invalid user %s",
authctxt->user);
-#ifdef HAVE_CYGWIN
- if (authenticated &&
+#ifdef HAVE_CYGWIN
+ if (authenticated &&
!check_nt_auth(type == SSH_CMSG_AUTH_PASSWORD,pw->pw_uid)) {
packet_disconnect("Authentication rejected for uid %d.",
(int)pw->pw_uid);
}
#else
/* Special handling for root */
- if (authenticated && authctxt->pw->pw_uid == 0 && !auth_root_allowed())
+ if (authenticated && authctxt->pw->pw_uid == 0 &&
+ !auth_root_allowed(get_authname(type)))
authenticated = 0;
#endif
-#ifdef USE_PAM
+#ifdef USE_PAM
if (authenticated && !do_pam_account(pw->pw_name, client_user))
authenticated = 0;
#endif
return;
if (authctxt->failures++ > AUTH_FAIL_MAX) {
-#ifdef WITH_AIXAUTHENTICATE
- loginfailed(authctxt->user,
- get_canonical_hostname(options.reverse_mapping_check),
+#ifdef WITH_AIXAUTHENTICATE
+ loginfailed(authctxt->user,
+ get_canonical_hostname(options.reverse_mapping_check),
"ssh");
#endif /* WITH_AIXAUTHENTICATE */
packet_disconnect(AUTH_FAIL_MSG, authctxt->user);
struct passwd *pw;
int plen;
u_int ulen;
- char *user, *style = NULL;
+ char *p, *user, *style = NULL;
/* Get the name of the user that we wish to log in as. */
packet_read_expect(&plen, SSH_CMSG_USER);
packet_integrity_check(plen, (4 + ulen), SSH_CMSG_USER);
if ((style = strchr(user, ':')) != NULL)
- *style++ = 0;
+ *style++ = '\0';
+ /* XXX - SSH.com Kerberos v5 braindeath. */
+ if ((p = strchr(user, '@')) != NULL)
+ *p = '\0';
+
authctxt = authctxt_new();
authctxt->user = user;
authctxt->style = style;
- setproctitle("%s", user);
-
-#ifdef AFS
- /* If machine has AFS, set process authentication group. */
- if (k_hasafs()) {
- k_setpag();
- k_unlog();
- }
-#endif /* AFS */
-
/* Verify that the user is a valid user. */
pw = getpwnam(user);
if (pw && allowed_user(pw)) {
}
authctxt->pw = pw;
+ setproctitle("%s", pw ? user : "unknown");
+
#ifdef USE_PAM
if (pw)
start_pam(user);
#ifdef WITH_AIXAUTHENTICATE
/* We don't have a pty yet, so just label the line as "ssh" */
- if (loginsuccess(authctxt->user,
+ if (loginsuccess(authctxt->user,
get_canonical_hostname(options.reverse_mapping_check),
"ssh", &aixloginmsg) < 0)
aixloginmsg = NULL;
#endif /* WITH_AIXAUTHENTICATE */
- xfree(authctxt->user);
- xfree(authctxt);
-
/* Perform session preparation. */
- do_authenticated(pw);
+ do_authenticated(authctxt);
}