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- dugsong@cvs.openbsd.org 2001/06/26 16:15:25 

[auth1.c auth.h auth-krb4.c auth-passwd.c readconf.c readconf.h
      servconf.c servconf.h session.c sshconnect1.c sshd.c]
     Kerberos v5 support for SSH1, mostly from Assar Westerlund
     <assar@freebsd.org> and Bjorn Gronvall <bg@sics.se>. markus@ ok
This commit is contained in:
Ben Lindstrom 2001-07-04 04:21:14 +00:00
parent b4c774cf88
commit ec95ed9b4c
12 changed files with 776 additions and 456 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -54,6 +54,11 @@
prototype pedant. not very creative...
- () -> (void)
- no variable names
- dugsong@cvs.openbsd.org 2001/06/26 16:15:25
[auth1.c auth.h auth-krb4.c auth-passwd.c readconf.c readconf.h
servconf.c servconf.h session.c sshconnect1.c sshd.c]
Kerberos v5 support for SSH1, mostly from Assar Westerlund
<assar@freebsd.org> and Bjorn Gronvall <bg@sics.se>. markus@ ok
20010629
- (bal) Removed net_aton() since we don't use it any more
@ -5881,4 +5886,4 @@
- Wrote replacements for strlcpy and mkdtemp
- Released 1.0pre1
$Id: ChangeLog,v 1.1357 2001/07/04 04:07:12 mouring Exp $
$Id: ChangeLog,v 1.1358 2001/07/04 04:21:14 mouring Exp $

364
auth-krb4.c
View File

@ -23,7 +23,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: auth-krb4.c,v 1.23 2001/01/22 08:15:00 markus Exp $");
RCSID("$OpenBSD: auth-krb4.c,v 1.24 2001/06/26 16:15:22 dugsong Exp $");
#include "ssh.h"
#include "ssh1.h"
@ -31,6 +31,7 @@ RCSID("$OpenBSD: auth-krb4.c,v 1.23 2001/01/22 08:15:00 markus Exp $");
#include "xmalloc.h"
#include "log.h"
#include "servconf.h"
#include "uidswap.h"
#include "auth.h"
#ifdef AFS
@ -38,70 +39,114 @@ RCSID("$OpenBSD: auth-krb4.c,v 1.23 2001/01/22 08:15:00 markus Exp $");
#endif
#ifdef KRB4
char *ticket = NULL;
extern ServerOptions options;
static int
krb4_init(void *context)
{
static int cleanup_registered = 0;
Authctxt *authctxt = (Authctxt *)context;
const char *tkt_root = TKT_ROOT;
struct stat st;
int fd;
if (!authctxt->krb4_ticket_file) {
/* Set unique ticket string manually since we're still root. */
authctxt->krb4_ticket_file = xmalloc(MAXPATHLEN);
#ifdef AFS
if (lstat("/ticket", &st) != -1)
tkt_root = "/ticket/";
#endif /* AFS */
snprintf(authctxt->krb4_ticket_file, MAXPATHLEN, "%s%u_%d",
tkt_root, authctxt->pw->pw_uid, getpid());
krb_set_tkt_string(authctxt->krb4_ticket_file);
}
/* Register ticket cleanup in case of fatal error. */
if (!cleanup_registered) {
fatal_add_cleanup(krb4_cleanup_proc, authctxt);
cleanup_registered = 1;
}
/* Try to create our ticket file. */
if ((fd = mkstemp(authctxt->krb4_ticket_file)) != -1) {
close(fd);
return (1);
}
/* Ticket file exists - make sure user owns it (just passed ticket). */
if (lstat(authctxt->krb4_ticket_file, &st) != -1) {
if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) &&
st.st_uid == authctxt->pw->pw_uid)
return (1);
}
/* Failure - cancel cleanup function, leaving ticket for inspection. */
log("WARNING: bad ticket file %s", authctxt->krb4_ticket_file);
fatal_remove_cleanup(krb4_cleanup_proc, authctxt);
cleanup_registered = 0;
xfree(authctxt->krb4_ticket_file);
authctxt->krb4_ticket_file = NULL;
return (0);
}
/*
* try krb4 authentication,
* return 1 on success, 0 on failure, -1 if krb4 is not available
*/
int
auth_krb4_password(struct passwd * pw, const char *password)
auth_krb4_password(Authctxt *authctxt, const char *password)
{
AUTH_DAT adata;
KTEXT_ST tkt;
struct hostent *hp;
u_long faddr;
char localhost[MAXHOSTNAMELEN];
char phost[INST_SZ];
char realm[REALM_SZ];
struct passwd *pw;
char localhost[MAXHOSTNAMELEN], phost[INST_SZ], realm[REALM_SZ];
u_int32_t faddr;
int r;
if ((pw = authctxt->pw) == NULL)
return (0);
/*
* Try Kerberos password authentication only for non-root
* users and only if Kerberos is installed.
*/
if (pw->pw_uid != 0 && krb_get_lrealm(realm, 1) == KSUCCESS) {
/* Set up our ticket file. */
if (!krb4_init(pw->pw_uid)) {
if (!krb4_init(authctxt)) {
log("Couldn't initialize Kerberos ticket file for %s!",
pw->pw_name);
goto kerberos_auth_failure;
goto failure;
}
/* Try to get TGT using our password. */
r = krb_get_pw_in_tkt((char *) pw->pw_name, "",
realm, "krbtgt", realm,
DEFAULT_TKT_LIFE, (char *) password);
r = krb_get_pw_in_tkt((char *) pw->pw_name, "", realm,
"krbtgt", realm, DEFAULT_TKT_LIFE, (char *)password);
if (r != INTK_OK) {
packet_send_debug("Kerberos V4 password "
"authentication for %s failed: %s",
pw->pw_name, krb_err_txt[r]);
goto kerberos_auth_failure;
debug("Kerberos v4 password authentication for %s "
"failed: %s", pw->pw_name, krb_err_txt[r]);
goto failure;
}
/* Successful authentication. */
chown(tkt_string(), pw->pw_uid, pw->pw_gid);
/*
* Now that we have a TGT, try to get a local
* "rcmd" ticket to ensure that we are not talking
* to a bogus Kerberos server.
*/
(void) gethostname(localhost, sizeof(localhost));
(void) strlcpy(phost, (char *) krb_get_phost(localhost),
INST_SZ);
gethostname(localhost, sizeof(localhost));
strlcpy(phost, (char *)krb_get_phost(localhost),
sizeof(phost));
r = krb_mk_req(&tkt, KRB4_SERVICE_NAME, phost, realm, 33);
if (r == KSUCCESS) {
if (!(hp = gethostbyname(localhost))) {
if ((hp = gethostbyname(localhost)) == NULL) {
log("Couldn't get local host address!");
goto kerberos_auth_failure;
goto failure;
}
memmove((void *) &faddr, (void *) hp->h_addr,
memmove((void *)&faddr, (void *)hp->h_addr,
sizeof(faddr));
/* Verify our "rcmd" ticket. */
r = krb_rd_req(&tkt, KRB4_SERVICE_NAME, phost,
faddr, &adata, "");
@ -110,119 +155,74 @@ auth_krb4_password(struct passwd * pw, const char *password)
* Probably didn't have a srvtab on
* localhost. Disallow login.
*/
log("Kerberos V4 TGT for %s unverifiable, "
log("Kerberos v4 TGT for %s unverifiable, "
"no srvtab installed? krb_rd_req: %s",
pw->pw_name, krb_err_txt[r]);
goto kerberos_auth_failure;
goto failure;
} else if (r != KSUCCESS) {
log("Kerberos V4 %s ticket unverifiable: %s",
log("Kerberos v4 %s ticket unverifiable: %s",
KRB4_SERVICE_NAME, krb_err_txt[r]);
goto kerberos_auth_failure;
goto failure;
}
} else if (r == KDC_PR_UNKNOWN) {
/*
* Disallow login if no rcmd service exists, and
* log the error.
*/
log("Kerberos V4 TGT for %s unverifiable: %s; %s.%s "
log("Kerberos v4 TGT for %s unverifiable: %s; %s.%s "
"not registered, or srvtab is wrong?", pw->pw_name,
krb_err_txt[r], KRB4_SERVICE_NAME, phost);
goto kerberos_auth_failure;
krb_err_txt[r], KRB4_SERVICE_NAME, phost);
goto failure;
} else {
/*
* TGT is bad, forget it. Possibly spoofed!
*/
packet_send_debug("WARNING: Kerberos V4 TGT "
"possibly spoofed for %s: %s",
pw->pw_name, krb_err_txt[r]);
goto kerberos_auth_failure;
debug("WARNING: Kerberos v4 TGT possibly spoofed "
"for %s: %s", pw->pw_name, krb_err_txt[r]);
goto failure;
}
/* Authentication succeeded. */
return 1;
kerberos_auth_failure:
krb4_cleanup_proc(NULL);
if (!options.kerberos_or_local_passwd)
return 0;
} else {
return (1);
} else
/* Logging in as root or no local Kerberos realm. */
packet_send_debug("Unable to authenticate to Kerberos.");
}
debug("Unable to authenticate to Kerberos.");
failure:
krb4_cleanup_proc(authctxt);
if (!options.kerberos_or_local_passwd)
return (0);
/* Fall back to ordinary passwd authentication. */
return -1;
return (-1);
}
void
krb4_cleanup_proc(void *ignore)
krb4_cleanup_proc(void *context)
{
Authctxt *authctxt = (Authctxt *)context;
debug("krb4_cleanup_proc called");
if (ticket) {
if (authctxt->krb4_ticket_file) {
(void) dest_tkt();
xfree(ticket);
ticket = NULL;
xfree(authctxt->krb4_ticket_file);
authctxt->krb4_ticket_file = NULL;
}
}
int
krb4_init(uid_t uid)
{
static int cleanup_registered = 0;
const char *tkt_root = TKT_ROOT;
struct stat st;
int fd;
if (!ticket) {
/* Set unique ticket string manually since we're still root. */
ticket = xmalloc(MAXPATHLEN);
#ifdef AFS
if (lstat("/ticket", &st) != -1)
tkt_root = "/ticket/";
#endif /* AFS */
snprintf(ticket, MAXPATHLEN, "%s%u_%d", tkt_root, uid, getpid());
(void) krb_set_tkt_string(ticket);
}
/* Register ticket cleanup in case of fatal error. */
if (!cleanup_registered) {
fatal_add_cleanup(krb4_cleanup_proc, NULL);
cleanup_registered = 1;
}
/* Try to create our ticket file. */
if ((fd = mkstemp(ticket)) != -1) {
close(fd);
return 1;
}
/* Ticket file exists - make sure user owns it (just passed ticket). */
if (lstat(ticket, &st) != -1) {
if (st.st_mode == (S_IFREG | S_IRUSR | S_IWUSR) &&
st.st_uid == uid)
return 1;
}
/* Failure - cancel cleanup function, leaving bad ticket for inspection. */
log("WARNING: bad ticket file %s", ticket);
fatal_remove_cleanup(krb4_cleanup_proc, NULL);
cleanup_registered = 0;
xfree(ticket);
ticket = NULL;
return 0;
}
int
auth_krb4(const char *server_user, KTEXT auth, char **client)
auth_krb4(Authctxt *authctxt, KTEXT auth, char **client)
{
AUTH_DAT adat = {0};
KTEXT_ST reply;
char instance[INST_SZ];
int r, s;
socklen_t slen;
u_int cksum;
Key_schedule schedule;
struct sockaddr_in local, foreign;
char instance[INST_SZ];
socklen_t slen;
u_int cksum;
int r, s;
s = packet_get_connection_in();
slen = sizeof(local);
memset(&local, 0, sizeof(local));
if (getsockname(s, (struct sockaddr *) & local, &slen) < 0)
@ -235,157 +235,139 @@ auth_krb4(const char *server_user, KTEXT auth, char **client)
}
instance[0] = '*';
instance[1] = 0;
/* Get the encrypted request, challenge, and session key. */
if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance, 0, &adat, ""))) {
packet_send_debug("Kerberos V4 krb_rd_req: %.100s", krb_err_txt[r]);
return 0;
if ((r = krb_rd_req(auth, KRB4_SERVICE_NAME, instance,
0, &adat, ""))) {
debug("Kerberos v4 krb_rd_req: %.100s", krb_err_txt[r]);
return (0);
}
des_key_sched((des_cblock *) adat.session, schedule);
*client = xmalloc(MAX_K_NAME_SZ);
(void) snprintf(*client, MAX_K_NAME_SZ, "%s%s%s@%s", adat.pname,
*adat.pinst ? "." : "", adat.pinst, adat.prealm);
/* Check ~/.klogin authorization now. */
if (kuserok(&adat, (char *) server_user) != KSUCCESS) {
packet_send_debug("Kerberos V4 .klogin authorization failed!");
log("Kerberos V4 .klogin authorization failed for %s to account %s",
*client, server_user);
if (kuserok(&adat, authctxt->user) != KSUCCESS) {
log("Kerberos v4 .klogin authorization failed for %s to "
"account %s", *client, authctxt->user);
xfree(*client);
return 0;
return (0);
}
/* Increment the checksum, and return it encrypted with the
session key. */
cksum = adat.checksum + 1;
cksum = htonl(cksum);
/* If we can't successfully encrypt the checksum, we send back an
empty message, admitting our failure. */
if ((r = krb_mk_priv((u_char *) & cksum, reply.dat, sizeof(cksum) + 1,
schedule, &adat.session, &local, &foreign)) < 0) {
packet_send_debug("Kerberos V4 mk_priv: (%d) %s", r, krb_err_txt[r]);
debug("Kerberos v4 mk_priv: (%d) %s", r, krb_err_txt[r]);
reply.dat[0] = 0;
reply.length = 0;
} else
reply.length = r;
/* Clear session key. */
memset(&adat.session, 0, sizeof(&adat.session));
packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
packet_put_string((char *) reply.dat, reply.length);
packet_send();
packet_write_wait();
return 1;
return (1);
}
#endif /* KRB4 */
#ifdef AFS
int
auth_kerberos_tgt(struct passwd *pw, const char *string)
auth_krb4_tgt(Authctxt *authctxt, const char *string)
{
CREDENTIALS creds;
if (pw == NULL)
goto auth_kerberos_tgt_failure;
struct passwd *pw;
if ((pw = authctxt->pw) == NULL)
goto failure;
temporarily_use_uid(pw);
if (!radix_to_creds(string, &creds)) {
log("Protocol error decoding Kerberos V4 tgt");
packet_send_debug("Protocol error decoding Kerberos V4 tgt");
goto auth_kerberos_tgt_failure;
log("Protocol error decoding Kerberos v4 TGT");
goto failure;
}
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */
strlcpy(creds.service, "krbtgt", sizeof creds.service);
if (strcmp(creds.service, "krbtgt")) {
log("Kerberos V4 tgt (%s%s%s@%s) rejected for %s", creds.pname,
creds.pinst[0] ? "." : "", creds.pinst, creds.realm,
pw->pw_name);
packet_send_debug("Kerberos V4 tgt (%s%s%s@%s) rejected for %s",
log("Kerberos v4 TGT (%s%s%s@%s) rejected for %s",
creds.pname, creds.pinst[0] ? "." : "", creds.pinst,
creds.realm, pw->pw_name);
goto auth_kerberos_tgt_failure;
goto failure;
}
if (!krb4_init(pw->pw_uid))
goto auth_kerberos_tgt_failure;
if (!krb4_init(authctxt))
goto failure;
if (in_tkt(creds.pname, creds.pinst) != KSUCCESS)
goto auth_kerberos_tgt_failure;
goto failure;
if (save_credentials(creds.service, creds.instance, creds.realm,
creds.session, creds.lifetime, creds.kvno,
&creds.ticket_st, creds.issue_date) != KSUCCESS) {
packet_send_debug("Kerberos V4 tgt refused: couldn't save credentials");
goto auth_kerberos_tgt_failure;
creds.session, creds.lifetime, creds.kvno, &creds.ticket_st,
creds.issue_date) != KSUCCESS) {
debug("Kerberos v4 TGT refused: couldn't save credentials");
goto failure;
}
/* Successful authentication, passed all checks. */
chown(tkt_string(), pw->pw_uid, pw->pw_gid);
packet_send_debug("Kerberos V4 tgt accepted (%s.%s@%s, %s%s%s@%s)",
creds.service, creds.instance, creds.realm, creds.pname,
creds.pinst[0] ? "." : "", creds.pinst, creds.realm);
debug("Kerberos v4 TGT accepted (%s%s%s@%s)",
creds.pname, creds.pinst[0] ? "." : "", creds.pinst, creds.realm);
memset(&creds, 0, sizeof(creds));
packet_start(SSH_SMSG_SUCCESS);
packet_send();
packet_write_wait();
return 1;
auth_kerberos_tgt_failure:
krb4_cleanup_proc(NULL);
restore_uid();
return (1);
failure:
krb4_cleanup_proc(authctxt);
memset(&creds, 0, sizeof(creds));
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
return 0;
restore_uid();
return (0);
}
int
auth_afs_token(struct passwd *pw, const char *token_string)
auth_afs_token(Authctxt *authctxt, const char *token_string)
{
CREDENTIALS creds;
struct passwd *pw;
uid_t uid;
if (pw == NULL) {
/* XXX fake protocol error */
packet_send_debug("Protocol error decoding AFS token");
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
return 0;
}
if ((pw = authctxt->pw) == NULL)
return (0);
if (!radix_to_creds(token_string, &creds)) {
log("Protocol error decoding AFS token");
packet_send_debug("Protocol error decoding AFS token");
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
return 0;
return (0);
}
if (strncmp(creds.service, "", 1) == 0) /* backward compatibility */
strlcpy(creds.service, "afs", sizeof creds.service);
if (strncmp(creds.pname, "AFS ID ", 7) == 0)
uid = atoi(creds.pname + 7);
else
uid = pw->pw_uid;
if (kafs_settoken(creds.realm, uid, &creds)) {
log("AFS token (%s@%s) rejected for %s", creds.pname, creds.realm,
pw->pw_name);
packet_send_debug("AFS token (%s@%s) rejected for %s", creds.pname,
creds.realm, pw->pw_name);
log("AFS token (%s@%s) rejected for %s",
creds.pname, creds.realm, pw->pw_name);
memset(&creds, 0, sizeof(creds));
packet_start(SSH_SMSG_FAILURE);
packet_send();
packet_write_wait();
return 0;
return (0);
}
packet_send_debug("AFS token accepted (%s@%s, %s@%s)", creds.service,
creds.realm, creds.pname, creds.realm);
debug("AFS token accepted (%s@%s)", creds.pname, creds.realm);
memset(&creds, 0, sizeof(creds));
packet_start(SSH_SMSG_SUCCESS);
packet_send();
packet_write_wait();
return 1;
return (1);
}
#endif /* AFS */

29
auth-passwd.c
View File

@ -36,7 +36,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: auth-passwd.c,v 1.22 2001/03/20 18:57:04 markus Exp $");
RCSID("$OpenBSD: auth-passwd.c,v 1.23 2001/06/26 16:15:23 dugsong Exp $");
#if !defined(USE_PAM) && !defined(HAVE_OSF_SIA)
@ -128,14 +128,14 @@ auth_password(Authctxt *authctxt, const char *password)
#endif
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
#ifdef BSD_AUTH
if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
(char *)password) == 0)
return 0;
else
return 1;
#ifdef KRB5
if (options.kerberos_authentication == 1) {
int ret = auth_krb5_password(authctxt, password);
if (ret == 1 || ret == 0)
return ret;
/* Fall back to ordinary passwd authentication. */
}
#endif
#ifdef HAVE_CYGWIN
if (is_winnt) {
HANDLE hToken = cygwin_logon_user(pw, password);
@ -146,21 +146,24 @@ auth_password(Authctxt *authctxt, const char *password)
return 1;
}
#endif
#ifdef WITH_AIXAUTHENTICATE
return (authenticate(pw->pw_name,password,&reenter,&authmsg) == 0);
#endif
#ifdef KRB4
if (options.kerberos_authentication == 1) {
int ret = auth_krb4_password(pw, password);
int ret = auth_krb4_password(authctxt, password);
if (ret == 1 || ret == 0)
return ret;
/* Fall back to ordinary passwd authentication. */
}
#endif
#ifdef BSD_AUTH
if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
(char *)password) == 0)
return 0;
else
return 1;
#endif
pw_password = pw->pw_passwd;
/*

53
auth.h
View File

@ -21,7 +21,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $OpenBSD: auth.h,v 1.20 2001/06/26 06:32:47 itojun Exp $
* $OpenBSD: auth.h,v 1.21 2001/06/26 16:15:23 dugsong Exp $
*/
#ifndef AUTH_H
#define AUTH_H
@ -36,23 +36,36 @@
#ifdef BSD_AUTH
#include <bsd_auth.h>
#endif
#ifdef KRB5
#include <krb5.h>
#endif
typedef struct Authctxt Authctxt;
typedef struct KbdintDevice KbdintDevice;
struct Authctxt {
int success;
int postponed;
int valid;
int attempt;
int failures;
char *user;
char *service;
struct passwd *pw;
char *style;
void *kbdintctxt;
int success;
int postponed;
int valid;
int attempt;
int failures;
char *user;
char *service;
struct passwd *pw;
char *style;
void *kbdintctxt;
#ifdef BSD_AUTH
auth_session_t *as;
auth_session_t *as;
#endif
#ifdef KRB4
char *krb4_ticket_file;
#endif
#ifdef KRB5
krb5_context krb5_ctx;
krb5_auth_context krb5_auth_ctx;
krb5_ccache krb5_fwd_ccache;
krb5_principal krb5_user;
char *krb5_ticket_file;
#endif
};
@ -125,21 +138,27 @@ int auth_rsa_challenge_dialog(RSA *);
* if the client could not be authenticated, and 1 if authentication was
* successful. This may exit if there is a serious protocol violation.
*/
int auth_krb4(const char *, KTEXT, char **);
int krb4_init(uid_t);
int auth_krb4(Authctxt *, KTEXT, char **);
int auth_krb4_password(Authctxt *, const char *);
void krb4_cleanup_proc(void *);
int auth_krb4_password(struct passwd *, const char *);
#ifdef AFS
#include <kafs.h>
/* Accept passed Kerberos v4 ticket-granting ticket and AFS tokens. */
int auth_kerberos_tgt(struct passwd *, const char *);
int auth_afs_token(struct passwd *, const char *);
int auth_krb4_tgt(Authctxt *, const char *);
int auth_afs_token(Authctxt *, const char *);
#endif /* AFS */
#endif /* KRB4 */
#ifdef KRB5
int auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client);
int auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt);
int auth_krb5_password(Authctxt *authctxt, const char *password);
void krb5_cleanup_proc(void *authctxt);
#endif /* KRB5 */
#include "auth-pam.h"
#include "auth2-pam.h"

109
auth1.c
View File

@ -10,7 +10,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: auth1.c,v 1.24 2001/06/23 15:12:17 itojun Exp $");
RCSID("$OpenBSD: auth1.c,v 1.25 2001/06/26 16:15:23 dugsong Exp $");
#include "xmalloc.h"
#include "rsa.h"
@ -24,6 +24,7 @@ RCSID("$OpenBSD: auth1.c,v 1.24 2001/06/23 15:12:17 itojun Exp $");
#include "auth.h"
#include "session.h"
#include "misc.h"
#include "uidswap.h"
/* import */
extern ServerOptions options;
@ -51,7 +52,7 @@ get_authname(int type)
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
@ -84,7 +85,7 @@ do_authloop(Authctxt *authctxt)
/* 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
@ -116,62 +117,64 @@ do_authloop(Authctxt *authctxt)
/* 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.");
@ -369,7 +372,7 @@ do_authentication()
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);
@ -379,8 +382,12 @@ do_authentication()
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;

47
readconf.c
View File

@ -12,7 +12,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: readconf.c,v 1.81 2001/06/23 02:34:30 markus Exp $");
RCSID("$OpenBSD: readconf.c,v 1.82 2001/06/26 16:15:23 dugsong Exp $");
#include "ssh.h"
#include "xmalloc.h"
@ -96,11 +96,14 @@ typedef enum {
oForwardAgent, oForwardX11, oGatewayPorts, oRhostsAuthentication,
oPasswordAuthentication, oRSAAuthentication, oFallBackToRsh, oUseRsh,
oChallengeResponseAuthentication, oXAuthLocation,
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
oKerberosAuthentication,
#endif /* KRB4 */
#endif
#if defined(AFS) || defined(KRB5)
oKerberosTgtPassing,
#endif
#ifdef AFS
oKerberosTgtPassing, oAFSTokenPassing,
oAFSTokenPassing,
#endif
oIdentityFile, oHostName, oPort, oCipher, oRemoteForward, oLocalForward,
oUser, oHost, oEscapeChar, oRhostsRSAAuthentication, oProxyCommand,
@ -137,11 +140,13 @@ static struct {
{ "challengeresponseauthentication", oChallengeResponseAuthentication },
{ "skeyauthentication", oChallengeResponseAuthentication }, /* alias */
{ "tisauthentication", oChallengeResponseAuthentication }, /* alias */
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
{ "kerberosauthentication", oKerberosAuthentication },
#endif /* KRB4 */
#ifdef AFS
#endif
#if defined(AFS) || defined(KRB5)
{ "kerberostgtpassing", oKerberosTgtPassing },
#endif
#ifdef AFS
{ "afstokenpassing", oAFSTokenPassing },
#endif
{ "fallbacktorsh", oFallBackToRsh },
@ -335,23 +340,21 @@ parse_flag:
case oChallengeResponseAuthentication:
intptr = &options->challenge_response_authentication;
goto parse_flag;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
case oKerberosAuthentication:
intptr = &options->kerberos_authentication;
goto parse_flag;
#endif /* KRB4 */
#ifdef AFS
#endif
#if defined(AFS) || defined(KRB5)
case oKerberosTgtPassing:
intptr = &options->kerberos_tgt_passing;
goto parse_flag;
#endif
#ifdef AFS
case oAFSTokenPassing:
intptr = &options->afs_token_passing;
goto parse_flag;
#endif
case oFallBackToRsh:
intptr = &options->fallback_to_rsh;
goto parse_flag;
@ -724,11 +727,13 @@ initialize_options(Options * options)
options->rsa_authentication = -1;
options->pubkey_authentication = -1;
options->challenge_response_authentication = -1;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
options->kerberos_authentication = -1;
#endif
#ifdef AFS
#if defined(AFS) || defined(KRB5)
options->kerberos_tgt_passing = -1;
#endif
#ifdef AFS
options->afs_token_passing = -1;
#endif
options->password_authentication = -1;
@ -799,16 +804,18 @@ fill_default_options(Options * options)
options->pubkey_authentication = 1;
if (options->challenge_response_authentication == -1)
options->challenge_response_authentication = 0;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
if (options->kerberos_authentication == -1)
options->kerberos_authentication = 1;
#endif /* KRB4 */
#ifdef AFS
#endif
#if defined(AFS) || defined(KRB5)
if (options->kerberos_tgt_passing == -1)
options->kerberos_tgt_passing = 1;
#endif
#ifdef AFS
if (options->afs_token_passing == -1)
options->afs_token_passing = 1;
#endif /* AFS */
#endif
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)

11
readconf.h
View File

@ -11,7 +11,7 @@
* called by a name other than "ssh" or "Secure Shell".
*/
/* RCSID("$OpenBSD: readconf.h,v 1.33 2001/06/26 06:32:58 itojun Exp $"); */
/* RCSID("$OpenBSD: readconf.h,v 1.34 2001/06/26 16:15:24 dugsong Exp $"); */
#ifndef READCONF_H
#define READCONF_H
@ -41,12 +41,13 @@ typedef struct {
int hostbased_authentication; /* ssh2's rhosts_rsa */
int challenge_response_authentication;
/* Try S/Key or TIS, authentication. */
#ifdef KRB4
int kerberos_authentication; /* Try Kerberos
* authentication. */
#if defined(KRB4) || defined(KRB5)
int kerberos_authentication; /* Try Kerberos authentication. */
#endif
#if defined(AFS) || defined(KRB5)
int kerberos_tgt_passing; /* Try Kerberos TGT passing. */
#endif
#ifdef AFS
int kerberos_tgt_passing; /* Try Kerberos tgt passing. */
int afs_token_passing; /* Try AFS token passing. */
#endif
int password_authentication; /* Try password

43
servconf.c
View File

@ -10,14 +10,11 @@
*/
#include "includes.h"
RCSID("$OpenBSD: servconf.c,v 1.84 2001/06/23 15:12:19 itojun Exp $");
RCSID("$OpenBSD: servconf.c,v 1.85 2001/06/26 16:15:24 dugsong Exp $");
#ifdef KRB4
#include <krb.h>
#endif
#ifdef AFS
#include <kafs.h>
#endif
#include "ssh.h"
#include "log.h"
@ -70,13 +67,15 @@ initialize_server_options(ServerOptions *options)
options->hostbased_uses_name_from_packet_only = -1;
options->rsa_authentication = -1;
options->pubkey_authentication = -1;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
options->kerberos_authentication = -1;
options->kerberos_or_local_passwd = -1;
options->kerberos_ticket_cleanup = -1;
#endif
#ifdef AFS
#if defined(AFS) || defined(KRB5)
options->kerberos_tgt_passing = -1;
#endif
#ifdef AFS
options->afs_token_passing = -1;
#endif
options->password_authentication = -1;
@ -170,20 +169,22 @@ fill_default_server_options(ServerOptions *options)
options->rsa_authentication = 1;
if (options->pubkey_authentication == -1)
options->pubkey_authentication = 1;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
if (options->kerberos_authentication == -1)
options->kerberos_authentication = (access(KEYFILE, R_OK) == 0);
if (options->kerberos_or_local_passwd == -1)
options->kerberos_or_local_passwd = 1;
if (options->kerberos_ticket_cleanup == -1)
options->kerberos_ticket_cleanup = 1;
#endif /* KRB4 */
#ifdef AFS
#endif
#if defined(AFS) || defined(KRB5)
if (options->kerberos_tgt_passing == -1)
options->kerberos_tgt_passing = 0;
#endif
#ifdef AFS
if (options->afs_token_passing == -1)
options->afs_token_passing = k_hasafs();
#endif /* AFS */
#endif
if (options->password_authentication == -1)
options->password_authentication = 1;
if (options->kbd_interactive_authentication == -1)
@ -224,11 +225,14 @@ typedef enum {
sPort, sHostKeyFile, sServerKeyBits, sLoginGraceTime, sKeyRegenerationTime,
sPermitRootLogin, sLogFacility, sLogLevel,
sRhostsAuthentication, sRhostsRSAAuthentication, sRSAAuthentication,
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
sKerberosAuthentication, sKerberosOrLocalPasswd, sKerberosTicketCleanup,
#endif
#if defined(AFS) || defined(KRB5)
sKerberosTgtPassing,
#endif
#ifdef AFS
sKerberosTgtPassing, sAFSTokenPassing,
sAFSTokenPassing,
#endif
sChallengeResponseAuthentication,
sPasswordAuthentication, sKbdInteractiveAuthentication, sListenAddress,
@ -267,13 +271,15 @@ static struct {
{ "rsaauthentication", sRSAAuthentication },
{ "pubkeyauthentication", sPubkeyAuthentication },
{ "dsaauthentication", sPubkeyAuthentication }, /* alias */
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
{ "kerberosauthentication", sKerberosAuthentication },
{ "kerberosorlocalpasswd", sKerberosOrLocalPasswd },
{ "kerberosticketcleanup", sKerberosTicketCleanup },
#endif
#ifdef AFS
#if defined(AFS) || defined(KRB5)
{ "kerberostgtpassing", sKerberosTgtPassing },
#endif
#ifdef AFS
{ "afstokenpassing", sAFSTokenPassing },
#endif
{ "passwordauthentication", sPasswordAuthentication },
@ -584,8 +590,7 @@ parse_flag:
case sPubkeyAuthentication:
intptr = &options->pubkey_authentication;
goto parse_flag;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
case sKerberosAuthentication:
intptr = &options->kerberos_authentication;
goto parse_flag;
@ -598,12 +603,12 @@ parse_flag:
intptr = &options->kerberos_ticket_cleanup;
goto parse_flag;
#endif
#ifdef AFS
#if defined(AFS) || defined(KRB5)
case sKerberosTgtPassing:
intptr = &options->kerberos_tgt_passing;
goto parse_flag;
#endif
#ifdef AFS
case sAFSTokenPassing:
intptr = &options->afs_token_passing;
goto parse_flag;

10
servconf.h
View File

@ -11,7 +11,7 @@
* called by a name other than "ssh" or "Secure Shell".
*/
/* RCSID("$OpenBSD: servconf.h,v 1.45 2001/06/26 06:33:00 itojun Exp $"); */
/* RCSID("$OpenBSD: servconf.h,v 1.46 2001/06/26 16:15:24 dugsong Exp $"); */
#ifndef SERVCONF_H
#define SERVCONF_H
@ -73,7 +73,7 @@ typedef struct {
int hostbased_uses_name_from_packet_only; /* experimental */
int rsa_authentication; /* If true, permit RSA authentication. */
int pubkey_authentication; /* If true, permit ssh2 pubkey authentication. */
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
int kerberos_authentication; /* If true, permit Kerberos
* authentication. */
int kerberos_or_local_passwd; /* If true, permit kerberos
@ -84,9 +84,11 @@ typedef struct {
int kerberos_ticket_cleanup; /* If true, destroy ticket
* file on logout. */
#endif
#ifdef AFS
int kerberos_tgt_passing; /* If true, permit Kerberos tgt
#if defined(AFS) || defined(KRB5)
int kerberos_tgt_passing; /* If true, permit Kerberos TGT
* passing. */
#endif
#ifdef AFS
int afs_token_passing; /* If true, permit AFS token passing. */
#endif
int password_authentication; /* If true, permit password

92
session.c
View File

@ -33,7 +33,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: session.c,v 1.95 2001/06/25 08:25:39 markus Exp $");
RCSID("$OpenBSD: session.c,v 1.96 2001/06/26 16:15:24 dugsong Exp $");
#include "ssh.h"
#include "ssh1.h"
@ -99,7 +99,8 @@ typedef struct Session Session;
struct Session {
int used;
int self;
struct passwd *pw;
struct passwd *pw;
Authctxt *authctxt;
pid_t pid;
/* tty */
char *term;
@ -198,6 +199,14 @@ do_authenticated(Authctxt *authctxt)
/* remove agent socket */
if (auth_get_socket_name())
auth_sock_cleanup_proc(authctxt->pw);
#ifdef KRB4
if (options.kerberos_ticket_cleanup)
krb4_cleanup_proc(authctxt);
#endif
#ifdef KRB5
if (options.kerberos_ticket_cleanup)
krb5_cleanup_proc(authctxt);
#endif
}
/*
@ -216,6 +225,7 @@ do_authenticated1(Authctxt *authctxt)
u_int proto_len, data_len, dlen;
s = session_new();
s->authctxt = authctxt;
s->pw = authctxt->pw;
/*
@ -300,6 +310,58 @@ do_authenticated1(Authctxt *authctxt)
if (packet_set_maxsize(packet_get_int()) > 0)
success = 1;
break;
#if defined(AFS) || defined(KRB5)
case SSH_CMSG_HAVE_KERBEROS_TGT:
if (!options.kerberos_tgt_passing) {
verbose("Kerberos TGT passing disabled.");
} else {
char *kdata = packet_get_string(&dlen);
packet_integrity_check(plen, 4 + dlen, type);
/* XXX - 0x41, see creds_to_radix version */
if (kdata[0] != 0x41) {
#ifdef KRB5
krb5_data tgt;
tgt.data = kdata;
tgt.length = dlen;
if (auth_krb5_tgt(s->authctxt, &tgt))
success = 1;
else
verbose("Kerberos v5 TGT refused for %.100s", s->authctxt->user);
#endif /* KRB5 */
} else {
#ifdef AFS
if (auth_krb4_tgt(s->authctxt, kdata))
success = 1;
else
verbose("Kerberos v4 TGT refused for %.100s", s->authctxt->user);
#endif /* AFS */
}
xfree(kdata);
}
break;
#endif /* AFS || KRB5 */
#ifdef AFS
case SSH_CMSG_HAVE_AFS_TOKEN:
if (!options.afs_token_passing || !k_hasafs()) {
verbose("AFS token passing disabled.");
} else {
/* Accept AFS token. */
char *token = packet_get_string(&dlen);
packet_integrity_check(plen, 4 + dlen, type);
if (auth_afs_token(s->authctxt, token))
success = 1;
else
verbose("AFS token refused for %.100s",
s->authctxt->user);
xfree(token);
}
break;
#endif /* AFS */
case SSH_CMSG_EXEC_SHELL:
case SSH_CMSG_EXEC_CMD:
@ -615,7 +677,7 @@ static int
check_quietlogin(Session *s, const char *command)
{
char buf[256];
struct passwd * pw = s->pw;
struct passwd *pw = s->pw;
struct stat st;
/* Return 1 if .hushlogin exists or a command given. */
@ -955,7 +1017,7 @@ void
do_child(Session *s, const char *command)
{
const char *shell, *hostname = NULL, *cp = NULL;
struct passwd * pw = s->pw;
struct passwd *pw = s->pw;
char buf[256];
char cmd[1024];
FILE *f = NULL;
@ -1134,10 +1196,10 @@ do_child(Session *s, const char *command)
/* Try to get AFS tokens for the local cell. */
if (k_hasafs()) {
char cell[64];
if (k_afs_cell_of_file(pw->pw_dir, cell, sizeof(cell)) == 0)
krb_afslog(cell, 0);
krb_afslog(0, 0);
}
#endif /* AFS */
@ -1221,16 +1283,16 @@ do_child(Session *s, const char *command)
child_set_env(&env, &envsize, "KRB5CCNAME", cp);
read_environment_file(&env, &envsize, "/etc/environment");
#endif
#ifdef KRB4
{
extern char *ticket;
if (ticket)
child_set_env(&env, &envsize, "KRBTKFILE", ticket);
}
#endif /* KRB4 */
if (s->authctxt->krb4_ticket_file)
child_set_env(&env, &envsize, "KRBTKFILE",
s->authctxt->krb4_ticket_file);
#endif
#ifdef KRB5
if (s->authctxt->krb5_ticket_file)
child_set_env(&env, &envsize, "KRB5CCNAME",
s->authctxt->krb5_ticket_file);
#endif
#ifdef USE_PAM
/* Pull in any environment variables that may have been set by PAM. */
do_pam_environment(&env, &envsize);

448
sshconnect1.c
View File

@ -13,7 +13,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: sshconnect1.c,v 1.36 2001/06/23 22:37:46 markus Exp $");
RCSID("$OpenBSD: sshconnect1.c,v 1.37 2001/06/26 16:15:24 dugsong Exp $");
#include <openssl/bn.h>
#include <openssl/evp.h>
@ -21,6 +21,9 @@ RCSID("$OpenBSD: sshconnect1.c,v 1.36 2001/06/23 22:37:46 markus Exp $");
#ifdef KRB4
#include <krb.h>
#endif
#ifdef KRB5
#include <krb5.h>
#endif
#ifdef AFS
#include <kafs.h>
#include "radix.h"
@ -43,6 +46,7 @@ RCSID("$OpenBSD: sshconnect1.c,v 1.36 2001/06/23 22:37:46 markus Exp $");
#include "readpass.h"
#include "cipher.h"
#include "canohost.h"
#include "auth.h"
/* Session id for the current session. */
u_char session_id[16];
@ -379,7 +383,7 @@ try_rhosts_rsa_authentication(const char *local_user, Key * host_key)
#ifdef KRB4
static int
try_kerberos_authentication(void)
try_krb4_authentication(void)
{
KTEXT_ST auth; /* Kerberos data */
char *reply;
@ -397,20 +401,21 @@ try_kerberos_authentication(void)
/* Don't do anything if we don't have any tickets. */
if (stat(tkt_string(), &st) < 0)
return 0;
strncpy(inst, (char *) krb_get_phost(get_canonical_hostname(1)), INST_SZ);
realm = (char *) krb_realmofhost(get_canonical_hostname(1));
strlcpy(inst, (char *)krb_get_phost(get_canonical_hostname(1)),
INST_SZ);
realm = (char *)krb_realmofhost(get_canonical_hostname(1));
if (!realm) {
debug("Kerberos V4: no realm for %s", get_canonical_hostname(1));
debug("Kerberos v4: no realm for %s", get_canonical_hostname(1));
return 0;
}
/* This can really be anything. */
checksum = (u_long) getpid();
checksum = (u_long)getpid();
r = krb_mk_req(&auth, KRB4_SERVICE_NAME, inst, realm, checksum);
if (r != KSUCCESS) {
debug("Kerberos V4 krb_mk_req failed: %s", krb_err_txt[r]);
debug("Kerberos v4 krb_mk_req failed: %s", krb_err_txt[r]);
return 0;
}
/* Get session key to decrypt the server's reply with. */
@ -420,26 +425,26 @@ try_kerberos_authentication(void)
return 0;
}
des_key_sched((des_cblock *) cred.session, schedule);
/* Send authentication info to server. */
packet_start(SSH_CMSG_AUTH_KERBEROS);
packet_put_string((char *) auth.dat, auth.length);
packet_send();
packet_write_wait();
/* Zero the buffer. */
(void) memset(auth.dat, 0, MAX_KTXT_LEN);
slen = sizeof(local);
memset(&local, 0, sizeof(local));
if (getsockname(packet_get_connection_in(),
(struct sockaddr *) & local, &slen) < 0)
(struct sockaddr *)&local, &slen) < 0)
debug("getsockname failed: %s", strerror(errno));
slen = sizeof(foreign);
memset(&foreign, 0, sizeof(foreign));
if (getpeername(packet_get_connection_in(),
(struct sockaddr *) & foreign, &slen) < 0) {
(struct sockaddr *)&foreign, &slen) < 0) {
debug("getpeername failed: %s", strerror(errno));
fatal_cleanup();
}
@ -448,96 +453,288 @@ try_kerberos_authentication(void)
switch (type) {
case SSH_SMSG_FAILURE:
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
debug("Kerberos V4 authentication failed.");
debug("Kerberos v4 authentication failed.");
return 0;
break;
case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
/* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
debug("Kerberos V4 authentication accepted.");
debug("Kerberos v4 authentication accepted.");
/* Get server's response. */
reply = packet_get_string((u_int *) &auth.length);
memcpy(auth.dat, reply, auth.length);
xfree(reply);
packet_integrity_check(plen, 4 + auth.length, type);
/*
* If his response isn't properly encrypted with the session
* key, and the decrypted checksum fails to match, he's
* bogus. Bail out.
*/
r = krb_rd_priv(auth.dat, auth.length, schedule, &cred.session,
&foreign, &local, &msg_data);
&foreign, &local, &msg_data);
if (r != KSUCCESS) {
debug("Kerberos V4 krb_rd_priv failed: %s", krb_err_txt[r]);
packet_disconnect("Kerberos V4 challenge failed!");
debug("Kerberos v4 krb_rd_priv failed: %s",
krb_err_txt[r]);
packet_disconnect("Kerberos v4 challenge failed!");
}
/* Fetch the (incremented) checksum that we supplied in the request. */
(void) memcpy((char *) &cksum, (char *) msg_data.app_data, sizeof(cksum));
memcpy((char *)&cksum, (char *)msg_data.app_data,
sizeof(cksum));
cksum = ntohl(cksum);
/* If it matches, we're golden. */
if (cksum == checksum + 1) {
debug("Kerberos V4 challenge successful.");
debug("Kerberos v4 challenge successful.");
return 1;
} else
packet_disconnect("Kerberos V4 challenge failed!");
packet_disconnect("Kerberos v4 challenge failed!");
break;
default:
packet_disconnect("Protocol error on Kerberos V4 response: %d", type);
packet_disconnect("Protocol error on Kerberos v4 response: %d", type);
}
return 0;
}
#endif /* KRB4 */
#ifdef AFS
#ifdef KRB5
static int
send_kerberos_tgt(void)
try_krb5_authentication(krb5_context *context, krb5_auth_context *auth_context)
{
krb5_error_code problem;
const char *tkfile;
struct stat buf;
krb5_ccache ccache = NULL;
const char *remotehost;
krb5_data ap;
int type, payload_len;
krb5_ap_rep_enc_part *reply = NULL;
int ret;
memset(&ap, 0, sizeof(ap));
problem = krb5_init_context(context);
if (problem) {
debug("Kerberos v5: krb5_init_context failed");
ret = 0;
goto out;
}
tkfile = krb5_cc_default_name(*context);
if (strncmp(tkfile, "FILE:", 5) == 0)
tkfile += 5;
if (stat(tkfile, &buf) == 0 && getuid() != buf.st_uid) {
debug("Kerberos v5: could not get default ccache (permission denied).");
ret = 0;
goto out;
}
problem = krb5_cc_default(*context, &ccache);
if (problem) {
debug("Kerberos v5: krb5_cc_default failed: %s",
krb5_get_err_text(*context, problem));
ret = 0;
goto out;
}
remotehost = get_canonical_hostname(1);
problem = krb5_mk_req(*context, auth_context, AP_OPTS_MUTUAL_REQUIRED,
"host", remotehost, NULL, ccache, &ap);
if (problem) {
debug("Kerberos v5: krb5_mk_req failed: %s",
krb5_get_err_text(*context, problem));
ret = 0;
goto out;
}
packet_start(SSH_CMSG_AUTH_KERBEROS);
packet_put_string((char *) ap.data, ap.length);
packet_send();
packet_write_wait();
xfree(ap.data);
ap.length = 0;
type = packet_read(&payload_len);
switch (type) {
case SSH_SMSG_FAILURE:
/* Should really be SSH_SMSG_AUTH_KERBEROS_FAILURE */
debug("Kerberos v5 authentication failed.");
ret = 0;
break;
case SSH_SMSG_AUTH_KERBEROS_RESPONSE:
/* SSH_SMSG_AUTH_KERBEROS_SUCCESS */
debug("Kerberos v5 authentication accepted.");
/* Get server's response. */
ap.data = packet_get_string((unsigned int *) &ap.length);
packet_integrity_check(payload_len, 4 + ap.length, type);
/* XXX je to dobre? */
problem = krb5_rd_rep(*context, *auth_context, &ap, &reply);
if (problem) {
ret = 0;
}
ret = 1;
break;
default:
packet_disconnect("Protocol error on Kerberos v5 response: %d",
type);
ret = 0;
break;
}
out:
if (ccache != NULL)
krb5_cc_close(*context, ccache);
if (reply != NULL)
krb5_free_ap_rep_enc_part(*context, reply);
if (ap.length > 0)
krb5_data_free(&ap);
return (ret);
}
static void
send_krb5_tgt(krb5_context context, krb5_auth_context auth_context)
{
int fd, type, payload_len;
krb5_error_code problem;
krb5_data outbuf;
krb5_ccache ccache = NULL;
krb5_creds creds;
krb5_kdc_flags flags;
const char *remotehost;
memset(&creds, 0, sizeof(creds));
memset(&outbuf, 0, sizeof(outbuf));
fd = packet_get_connection_in();
problem = krb5_auth_con_setaddrs_from_fd(context, auth_context, &fd);
if (problem)
goto out;
problem = krb5_cc_default(context, &ccache);
if (problem)
goto out;
problem = krb5_cc_get_principal(context, ccache, &creds.client);
if (problem)
goto out;
problem = krb5_build_principal(context, &creds.server,
strlen(creds.client->realm), creds.client->realm,
"krbtgt", creds.client->realm, NULL);
if (problem)
goto out;
creds.times.endtime = 0;
flags.i = 0;
flags.b.forwarded = 1;
flags.b.forwardable = krb5_config_get_bool(context, NULL,
"libdefaults", "forwardable", NULL);
remotehost = get_canonical_hostname(1);
problem = krb5_get_forwarded_creds(context, auth_context,
ccache, flags.i, remotehost, &creds, &outbuf);
if (problem)
goto out;
packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
packet_put_string((char *)outbuf.data, outbuf.length);
packet_send();
packet_write_wait();
type = packet_read(&payload_len);
if (type == SSH_SMSG_SUCCESS) {
char *pname;
krb5_unparse_name(context, creds.client, &pname);
debug("Kerberos v5 TGT forwarded (%s).", pname);
xfree(pname);
} else
debug("Kerberos v5 TGT forwarding failed.");
return;
out:
if (problem)
debug("Kerberos v5 TGT forwarding failed: %s",
krb5_get_err_text(context, problem));
if (creds.client)
krb5_free_principal(context, creds.client);
if (creds.server)
krb5_free_principal(context, creds.server);
if (ccache)
krb5_cc_close(context, ccache);
if (outbuf.data)
xfree(outbuf.data);
}
#endif /* KRB5 */
#ifdef AFS
static void
send_krb4_tgt(void)
{
CREDENTIALS *creds;
char pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
int r, type, plen;
char buffer[8192];
struct stat st;
char buffer[4096], pname[ANAME_SZ], pinst[INST_SZ], prealm[REALM_SZ];
int problem, type, len;
/* Don't do anything if we don't have any tickets. */
if (stat(tkt_string(), &st) < 0)
return 0;
return;
creds = xmalloc(sizeof(*creds));
if ((r = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm)) != KSUCCESS) {
debug("Kerberos V4 tf_fullname failed: %s", krb_err_txt[r]);
return 0;
}
if ((r = krb_get_cred("krbtgt", prealm, prealm, creds)) != GC_OK) {
debug("Kerberos V4 get_cred failed: %s", krb_err_txt[r]);
return 0;
}
problem = krb_get_tf_fullname(TKT_FILE, pname, pinst, prealm);
if (problem)
goto out;
problem = krb_get_cred("krbtgt", prealm, prealm, creds);
if (problem)
goto out;
if (time(0) > krb_life_to_time(creds->issue_date, creds->lifetime)) {
debug("Kerberos V4 ticket expired: %s", TKT_FILE);
return 0;
problem = RD_AP_EXP;
goto out;
}
creds_to_radix(creds, (u_char *)buffer, sizeof buffer);
xfree(creds);
creds_to_radix(creds, (u_char *)buffer, sizeof(buffer));
packet_start(SSH_CMSG_HAVE_KERBEROS_TGT);
packet_put_cstring(buffer);
packet_send();
packet_write_wait();
type = packet_read(&plen);
if (type == SSH_SMSG_FAILURE)
debug("Kerberos TGT for realm %s rejected.", prealm);
else if (type != SSH_SMSG_SUCCESS)
packet_disconnect("Protocol error on Kerberos TGT response: %d", type);
return 1;
type = packet_read(&len);
if (type == SSH_SMSG_SUCCESS)
debug("Kerberos v4 TGT forwarded (%s%s%s@%s).",
creds->pname, creds->pinst[0] ? "." : "",
creds->pinst, creds->realm);
else
debug("Kerberos v4 TGT rejected.");
xfree(creds);
return;
out:
debug("Kerberos v4 TGT passing failed: %s", krb_err_txt[problem]);
xfree(creds);
}
static void
@ -546,10 +743,10 @@ send_afs_tokens(void)
CREDENTIALS creds;
struct ViceIoctl parms;
struct ClearToken ct;
int i, type, len, plen;
int i, type, len;
char buf[2048], *p, *server_cell;
char buffer[8192];
/* Move over ktc_GetToken, here's something leaner. */
for (i = 0; i < 100; i++) { /* just in case */
parms.in = (char *) &i;
@ -559,7 +756,7 @@ send_afs_tokens(void)
if (k_pioctl(0, VIOCGETTOK, &parms, 0) != 0)
break;
p = buf;
/* Get secret token. */
memcpy(&creds.ticket_st.length, p, sizeof(u_int));
if (creds.ticket_st.length > MAX_KTXT_LEN)
@ -567,7 +764,7 @@ send_afs_tokens(void)
p += sizeof(u_int);
memcpy(creds.ticket_st.dat, p, creds.ticket_st.length);
p += creds.ticket_st.length;
/* Get clear token. */
memcpy(&len, p, sizeof(len));
if (len != sizeof(struct ClearToken))
@ -577,20 +774,22 @@ send_afs_tokens(void)
p += len;
p += sizeof(len); /* primary flag */
server_cell = p;
/* Flesh out our credentials. */
strlcpy(creds.service, "afs", sizeof creds.service);
strlcpy(creds.service, "afs", sizeof(creds.service));
creds.instance[0] = '\0';
strlcpy(creds.realm, server_cell, REALM_SZ);
memcpy(creds.session, ct.HandShakeKey, DES_KEY_SZ);
creds.issue_date = ct.BeginTimestamp;
creds.lifetime = krb_time_to_life(creds.issue_date, ct.EndTimestamp);
creds.lifetime = krb_time_to_life(creds.issue_date,
ct.EndTimestamp);
creds.kvno = ct.AuthHandle;
snprintf(creds.pname, sizeof(creds.pname), "AFS ID %d", ct.ViceId);
creds.pinst[0] = '\0';
/* Encode token, ship it off. */
if (creds_to_radix(&creds, (u_char *) buffer, sizeof buffer) <= 0)
if (creds_to_radix(&creds, (u_char *)buffer,
sizeof(buffer)) <= 0)
break;
packet_start(SSH_CMSG_HAVE_AFS_TOKEN);
packet_put_cstring(buffer);
@ -599,8 +798,8 @@ send_afs_tokens(void)
/* Roger, Roger. Clearance, Clarence. What's your vector,
Victor? */
type = packet_read(&plen);
type = packet_read(&len);
if (type == SSH_SMSG_FAILURE)
debug("AFS token for cell %s rejected.", server_cell);
else if (type != SSH_SMSG_SUCCESS)
@ -622,9 +821,9 @@ try_challenge_response_authentication(void)
u_int clen;
char prompt[1024];
char *challenge, *response;
debug("Doing challenge reponse authentication.");
for (i = 0; i < options.number_of_password_prompts; i++) {
/* request a challenge */
packet_start(SSH_CMSG_AUTH_TIS);
@ -913,9 +1112,13 @@ void
ssh_userauth1(const char *local_user, const char *server_user, char *host,
Key **keys, int nkeys)
{
#ifdef KRB5
krb5_context context = NULL;
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");
@ -934,43 +1137,40 @@ ssh_userauth1(const char *local_user, const char *server_user, char *host,
/* check whether the connection was accepted without authentication. */
if (type == SSH_SMSG_SUCCESS)
return;
goto success;
if (type != SSH_SMSG_FAILURE)
packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER",
type);
#ifdef AFS
/* Try Kerberos tgt passing if the server supports it. */
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
options.kerberos_tgt_passing) {
if (options.cipher == SSH_CIPHER_NONE)
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
(void) send_kerberos_tgt();
packet_disconnect("Protocol error: got %d in response to SSH_CMSG_USER", type);
#ifdef KRB5
if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
options.kerberos_authentication) {
debug("Trying Kerberos v5 authentication.");
if (try_krb5_authentication(&context, &auth_context)) {
type = packet_read(&payload_len);
if (type == SSH_SMSG_SUCCESS)
goto success;
if (type != SSH_SMSG_FAILURE)
packet_disconnect("Protocol error: got %d in response to Kerberos v5 auth", type);
}
}
/* Try AFS token passing if the server supports it. */
if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) &&
options.afs_token_passing && k_hasafs()) {
if (options.cipher == SSH_CIPHER_NONE)
log("WARNING: Encryption is disabled! Token will be transmitted in the clear!");
send_afs_tokens();
}
#endif /* AFS */
#endif /* KRB5 */
#ifdef KRB4
if ((supported_authentications & (1 << SSH_AUTH_KERBEROS)) &&
options.kerberos_authentication) {
debug("Trying Kerberos authentication.");
if (try_kerberos_authentication()) {
/* The server should respond with success or failure. */
debug("Trying Kerberos v4 authentication.");
if (try_krb4_authentication()) {
type = packet_read(&payload_len);
if (type == SSH_SMSG_SUCCESS)
return;
goto success;
if (type != SSH_SMSG_FAILURE)
packet_disconnect("Protocol error: got %d in response to Kerberos auth", type);
packet_disconnect("Protocol error: got %d in response to Kerberos v4 auth", type);
}
}
#endif /* KRB4 */
/*
* Use rhosts authentication if running in privileged socket and we
* do not wish to remain anonymous.
@ -986,7 +1186,7 @@ ssh_userauth1(const char *local_user, const char *server_user, char *host,
/* The server should respond with success or failure. */
type = packet_read(&payload_len);
if (type == SSH_SMSG_SUCCESS)
return;
goto success;
if (type != SSH_SMSG_FAILURE)
packet_disconnect("Protocol error: got %d in response to rhosts auth",
type);
@ -1000,7 +1200,7 @@ ssh_userauth1(const char *local_user, const char *server_user, char *host,
for (i = 0; i < nkeys; i++) {
if (keys[i] != NULL && keys[i]->type == KEY_RSA1 &&
try_rhosts_rsa_authentication(local_user, keys[i]))
return;
goto success;
}
}
/* Try RSA authentication if the server supports it. */
@ -1012,20 +1212,20 @@ ssh_userauth1(const char *local_user, const char *server_user, char *host,
* it, whereas identity files may require passphrases.
*/
if (try_agent_authentication())
return;
goto success;
/* Try RSA authentication for each identity. */
for (i = 0; i < options.num_identity_files; i++)
if (options.identity_keys[i] != NULL &&
options.identity_keys[i]->type == KEY_RSA1 &&
try_rsa_authentication(options.identity_files[i]))
return;
goto success;
}
/* Try challenge response authentication if the server supports it. */
if ((supported_authentications & (1 << SSH_AUTH_TIS)) &&
options.challenge_response_authentication && !options.batch_mode) {
if (try_challenge_response_authentication())
return;
goto success;
}
/* Try password authentication if the server supports it. */
if ((supported_authentications & (1 << SSH_AUTH_PASSWORD)) &&
@ -1035,9 +1235,41 @@ ssh_userauth1(const char *local_user, const char *server_user, char *host,
snprintf(prompt, sizeof(prompt), "%.30s@%.128s's password: ",
server_user, host);
if (try_password_authentication(prompt))
return;
goto success;
}
/* All authentication methods have failed. Exit with an error message. */
fatal("Permission denied.");
/* NOTREACHED */
success:
#ifdef KRB5
/* Try Kerberos v5 TGT passing. */
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
options.kerberos_tgt_passing && context && auth_context) {
if (options.cipher == SSH_CIPHER_NONE)
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
send_krb5_tgt(context, auth_context);
}
if (auth_context)
krb5_auth_con_free(context, auth_context);
if (context)
krb5_free_context(context);
#endif
#ifdef AFS
/* Try Kerberos v4 TGT passing if the server supports it. */
if ((supported_authentications & (1 << SSH_PASS_KERBEROS_TGT)) &&
options.kerberos_tgt_passing) {
if (options.cipher == SSH_CIPHER_NONE)
log("WARNING: Encryption is disabled! Ticket will be transmitted in the clear!");
send_krb4_tgt();
}
/* Try AFS token passing if the server supports it. */
if ((supported_authentications & (1 << SSH_PASS_AFS_TOKEN)) &&
options.afs_token_passing && k_hasafs()) {
if (options.cipher == SSH_CIPHER_NONE)
log("WARNING: Encryption is disabled! Token will be transmitted in the clear!");
send_afs_tokens();
}
#endif /* AFS */
}

19
sshd.c
View File

@ -40,7 +40,7 @@
*/
#include "includes.h"
RCSID("$OpenBSD: sshd.c,v 1.201 2001/06/23 19:12:43 markus Exp $");
RCSID("$OpenBSD: sshd.c,v 1.202 2001/06/26 16:15:25 dugsong Exp $");
#include <openssl/dh.h>
#include <openssl/bn.h>
@ -1160,13 +1160,13 @@ main(int ac, char **av)
"originating port not trusted.");
options.rhosts_authentication = 0;
}
#ifdef KRB4
#if defined(KRB4) && !defined(KRB5)
if (!packet_connection_is_ipv4() &&
options.kerberos_authentication) {
debug("Kerberos Authentication disabled, only available for IPv4.");
options.kerberos_authentication = 0;
}
#endif /* KRB4 */
#endif /* KRB4 && !KRB5 */
#ifdef AFS
/* If machine has AFS, set process authentication group. */
if (k_hasafs()) {
@ -1186,13 +1186,6 @@ main(int ac, char **av)
do_ssh1_kex();
do_authentication();
}
#ifdef KRB4
/* Cleanup user's ticket cache file. */
if (options.kerberos_ticket_cleanup)
(void) dest_tkt();
#endif /* KRB4 */
/* The connection has been terminated. */
verbose("Closing connection to %.100s", remote_ip);
@ -1268,13 +1261,15 @@ do_ssh1_kex(void)
auth_mask |= 1 << SSH_AUTH_RHOSTS_RSA;
if (options.rsa_authentication)
auth_mask |= 1 << SSH_AUTH_RSA;
#ifdef KRB4
#if defined(KRB4) || defined(KRB5)
if (options.kerberos_authentication)
auth_mask |= 1 << SSH_AUTH_KERBEROS;
#endif
#ifdef AFS
#if defined(AFS) || defined(KRB5)
if (options.kerberos_tgt_passing)
auth_mask |= 1 << SSH_PASS_KERBEROS_TGT;
#endif
#ifdef AFS
if (options.afs_token_passing)
auth_mask |= 1 << SSH_PASS_AFS_TOKEN;
#endif